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    Wyświetlanie 1-93 z 93
    Tytuł:
    On Biquadratic Interlayer Coupling in Magnetic Multilayers
    Autorzy:
    Barnaś, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1930611.pdf
    Data publikacji:
    1994-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Rr
    75.70.Cn
    Opis:
    Intrinsic biquadratic interlayer coupling in magnetic layered structures is analysed theoretically within the spin-polarized free-electron approximation. The corresponding coupling parameter oscillates with the interlayer thickness with the oscillation period equal to half of that for bilinear term. An extrinsic mechanism following from a competition between the intra- and interlayer exchange coupling is also discussed.
    Źródło:
    Acta Physica Polonica A; 1994, 85, 2; 461-464
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Właściwości narzędzi skrawających z wielowarstwowymi powłokami typu ceramika/ceramika
    Properties of cutting tools with ceramic/ceramic multilayers
    Autorzy:
    Kot, M.
    Rakowski, W.
    Czechowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/190516.pdf
    Data publikacji:
    2009
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    powłoki wielowarstwowe ceramiczne
    narzędzia skrawające
    twardość
    zużycie
    ceramic multilayers
    cutting tools
    hardness
    wear
    Opis:
    W artykule przedstawiono wyniki badań mikromechanicznych i tribologicznych powłok wielowarstwowych typu ceramika–ceramika nałożonych na płytki skrawające WC-Co. Badano multiwarstwy TiAlN/TiN oraz TiAlN/CrN o grubości pojedynczych podwarstw 60 nm. Powłoki były wytworzone metodą łukowo-plazmową. Dla porównania dołączono komercyjną płytkę z powłoką TiAlSiN oraz płytkę bez powłoki. Przeprowadzono pomiary właściwości mikromechanicznych oraz tribologicznych w styku kula–tarcza. Przeprowadzono także testy eksploatacyjne ostrzy skrawających podczas toczenia utwardzonej stali NC6. Obydwie z proponowanych multiwarstw TiAlN/TiN i TiAlN/CrN podnoszą odpowiednio 3,1 i 1,4 razy trwałość ostrzy skrawających w stosunku do ostrza WC-Co bez powłoki. Trwałość ich jest także wyższa od trwałości ostrza z powłoką TiAlSiN, dostępnego na rynku.
    Cutting tools for High Speed Machining (HSM) work under high stress and in high temperature. Additional machining processes are lead without cutting fluids that cause significant wear on the tool rake face. These high mechanical and thermal loads demand cutting tools with new kinds of coatings like ceramic/ceramic multilayers. Tested ceramic multilayers, TiAlN/TiN and TiAlN/CrN, have been deposited using cathodic arc plasma evaporation on WC-Co inserts. Commerce tools with a TiAlSiN coating and WC-Co without coating were tested for comparison with proposed new materials. TiAlN/TiN and TiAlN/CrN coatings have a hardness of 36 and 32 GPa, respectively. Low mismatch of lattice parameters especially for TiN and TiAlN can cause strengthening of the TiAlN/TiN multilayer, giving high hardness and wear resistance. Scratch tests confirm the very good multilayer coatings-substrates adhesion. Cutting test were done by the turning of quenched NC6 tool steel. Both multilayers TiAlN/TiN and TiAlN/CrN give rise of tool life over 3 and 1.4 times, respectively, in comparison with uncoated inserts. The durability of tools with multilayers is higher than commercial tool with TiAlSiN. Presented results show the high potential of multilayers as a new kind of coating for HSM of hardened steels.
    Źródło:
    Tribologia; 2009, 4; 103-112
    0208-7774
    Pojawia się w:
    Tribologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Giant Magnetoresistance in Permalloy/Copper Multilayers
    Autorzy:
    Luciński, T.
    Stobiecki, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955449.pdf
    Data publikacji:
    1997-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Jt
    75.70.Cn
    Opis:
    The oscillatory behaviour of the giant magnetoresistivity versus Cu sublayer thickness was observed in Ni$\text{}_{83}$Fe$\text{}_{17}$/Cu multilayers with an oscillation period of 1 nm independently of buffer layer and substrates used in the experiment. The giant magnetoresistance field sensitivity equal to 0.02%/Oe and 0.15%/Oe for the first and the second maximum respectively, were found. It was shown that the giant magnetoresistance effect in our multilayers is not only due to the antiferromagnetic coupling between adjacent permalloy layers but also due to the superparamagnetic-like behaviour related to the existence of the intermixed interfacial areas.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 2; 273-275
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ferromagnetic Resonance in Fe/Zr Multilayers
    Autorzy:
    Dubowik, J.
    Stobiecki, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1930609.pdf
    Data publikacji:
    1994-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    75.70.-i
    Opis:
    We report our ferromagnetic resonance measurements for three series of Fe/Zr multilayers with thickness ratio of Fe to Zr sublayers equal to 2:1, 1:1, and 1:2, respectively. These measurements may serve as an example of employing ferromagnetic resonance technique as a sensitive probe for monitoring the magnetic phases formed at interfaces in the earliest stages of the interdiffusion reaction in multilayer Fe/Zr films for which the onset of the amorphization takes place during deposition due to thermodynamics of the system. The resulting structure may be regarded as strongly inhomogeneous one that includes distinct ferromagnetic phases related to the Fe atoms in various surroundings.
    Źródło:
    Acta Physica Polonica A; 1994, 85, 2; 449-453
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EMC shielding in power electronics multilayers
    Autorzy:
    Schuh, S.
    Albach, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/262725.pdf
    Data publikacji:
    2005
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Tematy:
    power electronics
    multilayer
    planar passive component
    analytical analysis
    Opis:
    The integration of passive components in printed circuit boards by using structured layers of different material leads to completely new technical challenges, both in technological realisations and in simulations or modelling of the embedded components. The integration of uiductive components is very interesting due to the substantial place reduction on the surface of the printed circuit board. In this context the shielding of the stray field of these inductive components leads to some new approaches in magnetic field calculation and simulation by planar structures. So in this paper the influence of FPC foils (Ferrite Polymer Compounds), m-metal and thin layers of copper on the magnetic field distribution and thus on the inductive coupling mechanisms in multilayers is analytically calculated and verified by some measurements. The presented results - measurement and simulation - lead to the final conclusion that the integration ofi-metal in comparison to FPC foils and thin layers of copper in the multilayer is one of the promising procedures for EMC-shielding.
    Źródło:
    Electrical Power Quality and Utilisation. Journal; 2005, 11, 2; 57-63
    1896-4672
    Pojawia się w:
    Electrical Power Quality and Utilisation. Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exchange Coupling of Magnetic Multilayers in Spin-Polarized Jellium
    Autorzy:
    Schmidt, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955446.pdf
    Data publikacji:
    1997-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.20.-r
    75.70.-i
    Opis:
    The bilinear and biquadratic coupling between two metallic layers separated by a nonmagnetic metal spacer are studied. The paper contains analytical formulae for the coupling which are obtained from the energy potential of the spin-polarized electron gas. The formulae for the coupling are obtained in the framework of the Hohenberg-Kohn formalism of the density functional theory and variables of the coupling are the electron density and the spin polarization of the magnetic multilayer.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 2; 265-268
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetisation of Co/Ti Multilayers
    Autorzy:
    Smardz, K.
    Smardz, L.
    Jezierski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013084.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.-i
    75.30.Et
    Opis:
    We studied experimentally and theoretically the magnetisation of the Co/Ti multilayers. The results showed that the magnetic moments on Co atoms located at the Co-Ti interface are strongly reduced. For d$\text{}_{Ti}$=0.35 nm the estimated effective non-magnetic Co thickness at the Co-Ti interface amounts ≈ 0.08 nm and ≈ 0.1 nm at 4 K and 295 K, respectively. We found a good agreement between experimentally determined and theoretically calculated magnetisations.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 507-510
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Obciążenie graniczne powłok wielowarstwowych TiN/CrN w styku tribologicznym kula-tarcza
    Load capacity of TiN/CrN multilayers coatings in ball-on-disc tribological contact
    Autorzy:
    Zimowski, S.
    Rakowski, W.
    Major, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/190330.pdf
    Data publikacji:
    2009
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    multiwarstwy
    TiN/CrN
    obciążenie graniczne
    tarcie
    zużycie
    multilayers
    load capacity
    friction
    wear
    Opis:
    W artykule przedstawiono wyniki badań strukturalnych, mikromechanicznych i tribologicznych powłok wielowarstwowych typu TiN/CrN. Powłoki o całkowitej grubości 1 μm, zbudowane z 2, 8 i 32 na przemian ułożonych warstw TiN i CrN osadzono laserem impulsowym na stali ferrytycznej metodą PLD (Pulsed Laser Deposition). Strukturę powłok badano z użyciem elektronowego mikroskopu transmisyjnego (TEM). Badania właściwości mechanicznych wykazały zależność twardości i modułu sprężystości od liczby warstw w powłoce. Badania tribologiczne wykonano w styku kula (Al2O3) – tarcza w warunkach tarcia technicznie suchego, stosując obciążenie 0,5; 1 i 2N. Zbyt duże obciążenie powłok ceramicznych pracujących w warunkach styku skoncentrowanego może spowodować przekroczenie nośności układu powłoka–podłoże, co prowadzi do pękania warstwy ceramicznej i gwałtownego jej zużycia. Graniczną wartość obciążenia określono jako najmniejszy nacisk na kulkę powodujący gwałtowne zużycie powłoki o charakterze patologicznym. Na podstawie przeprowadzonych badań można wnioskować, że zwiększenie liczby warstw w powłoce wielowarstwowej od 2 do 32, z równoczesnym zmniejszaniem ich grubości od 500 nm do 31 nm ma silny wpływ na właściwości tribologiczne. Największe obciążenie graniczne oraz największą odporność na zużycie uzyskano dla powłok złożonych z 32 warstw, charakteryzujących się zarazem najmniejszym współczynnikiem tarcia.
    The structure and micromechanical and tribological properties of the multilayer of TiN/CrN are presented in the paper. The TiN/CrN coatings built of 2, 8 and 32 layers with the overall thickness of 1μm obtained by Pulsed Laser Deposition (PLD) method were investigated. Analysis of transmission electron microscopy images (TEM) showed highly defective columnar structure of individual layers. The hardness and elastic modulus depend on the number of layers in the coating. In the case when a load carrying capacity of the ceramic coating-substrate system is exceed, ceramic layer cracks are created and multiply wear due to the presence of the hard abrasive particles between sliding surfaces. The load carrying capacity was defined as the smallest load applied on of the ball, which induced rapid abrasive wear of the coating. An increase in the number of the layers in the coating from 2 to 32, with a decrease of their thickness from 500 nm to 31 nm, strongly influence of the tribological properties. The maximum hardness (21 GPa) and the best adherence (LC = 8,4 N) are presented in the 8-layers coating, while the 32-layers coating showed the highest load carrying capacity and wear resistance as well as the lowest friction coefficient (0,1).
    Źródło:
    Tribologia; 2009, 4; 275-284
    0208-7774
    Pojawia się w:
    Tribologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and Magnetic Propertics of Fe/Zr Multilayers
    Autorzy:
    Szymański, B.
    Stobiecki, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1930610.pdf
    Data publikacji:
    1994-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    75.70.-i
    Opis:
    In this paper we report results of investigation into structure and magnetic properties of as-deposited Fe/Zr multilayers with different wavelength of modulation, λ, and thicknesses ratio of sublayers r = d$\text{}_{Fe}$/d$\text{}_{Zr}$. Three series of samples with r equal to 0.5, 1, 2 and λ from 12 nm to 1.2 nm were prepared by sputtering technique. The samples were studied by X-ray diffraction and torque curve measurements. It is shown that during deposition amorphization process takes place at interfaces. For nominal Fe sublayer thickness d$\text{}_{Fe}$ smaller than 2 nm the multilayers are found to be completely amorphous independently of r, and consist of alternating Fe-rich and Fe-poor amorphous sublayers.
    Źródło:
    Acta Physica Polonica A; 1994, 85, 2; 455-459
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculation of Oscillatory Exchange in bcc-Fe/Cu Multilayers
    Autorzy:
    Krompiewski, S.
    Pirnay, J.
    Krey, U.
    Süss, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1930614.pdf
    Data publikacji:
    1994-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.Ak
    Opis:
    Within a tight-binding LMTO approach in the atomic sphere approximation we calculate the exchange interaction, J, between magnetic Fe slabs in a periodic multilayer arrangement m Fe/n Cu/ .... We concentrate on cases, where Cu adapts to the bcc structure of Fe. For the "open" (100)-interface our results suggest that a minimal number of m = 13 Fe monolayers per Fe slab is necessary to get antiferromagnetic coupling. For m = 16 we find antiferromagnetic coupling for 8 ≤ n ≤ 14, i.e. a long period of ca. 11 and a short period of 2 Cu monolayers. In contrast, for the (110)-interfaces, only a long period of 14 monolayers is found, i.e. the coupling is antiferromagnetic for 7 ≤ n ≤ 14 already for small values of m. We then model the roughness by mutual interchange of 50% of the Fe and Cu atoms, respectively, in the interface layers and find that, due to the interchange, the coupling constant J, as a function of the Cu-spacer thickness n, roughly shifts by half a mono-layer to the right. In the (100)-case, the short period gets washed out by the roughness.
    Źródło:
    Acta Physica Polonica A; 1994, 85, 2; 475-478
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coupled Waves in Two-Phase Periodic Planar Multilayers
    Autorzy:
    Kapelewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493229.pdf
    Data publikacji:
    2011-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    41.20.Jb
    43.20.Mv
    03.50.De
    Opis:
    In the paper a consequently dynamic model approach to the magnetoelectric coupling is proposed. As opposed to the static case the approach includes both the elastic equation of motion and the full set of the Maxwell equations for effective composite medium. The analytical treatment is performed from two layers of $\infty_m$ symmetry and results in closed relations for propagation characteristics of coupled elasto-electrodynamic waves for millimeter-length range.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 4; 647-650
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Low Temperature Properties of Inhomogeneous Magnetic Multilayers
    Autorzy:
    Urbaniak-Kucharczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1387020.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Gw
    75.70.Ak
    76.50.+g
    Opis:
    System of two magnetic layers with nonuniform distribution of anisotropy parameter and exchange coupled by nonmagnetic spacer is studied by means of the Green function approach. Our attention is focussed on the elementary excitations and low temperature magnetisation behavior. The spin wave parameter B in the Bloch law $T^{3/2}$ is found as an oscillatory function of a spacer thickness. The effects of damping leading to non-zero line-width of ferromagnetic resonance peaks are also taken into account. As a result the dependence of resonance line-width on parameters characterizing system under consideration is obtained for the case of uniform anisotropy parameter and for quadratic distribution of this parameter in magnetic layers, respectively.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 543-545
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interlayer Exchange Coupling and Giant Magnetoresistance in Magnetic Multilayers
    Autorzy:
    Bloemen, P. J. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945210.pdf
    Data publikacji:
    1996-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Et
    75.50.Rr
    Opis:
    An introduction is given on the subject of magnetic metallic multilayers. These artificial structures appear to display several fascinating physical phenomonena which are of fundamental as well as technological interest. Two examples, the magnetic coupling between ferromagnetic layers across a non-magnetic spacer layer and the giant magnetoresistance are emphasized in this article. For each of these, key experimental observations are reviewed followed by a discussion of the physical principles underlying the phenomenon.
    Źródło:
    Acta Physica Polonica A; 1996, 89, 3; 277-299
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    CPP-Giant Magnetoresistance and Thermoelectric Power of Multilayers
    Autorzy:
    Krompiewski, S.
    Krey, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/1953184.pdf
    Data publikacji:
    1997-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.Pa
    75.70.Cn
    75.70.-i
    Opis:
    Oscillations of magnetoresistance and thermoelectric power vs. both nonmagnetic spacer and ferromagnetic slab thicknesses are studied in the current-perpendicular-to-plane geometry, in terms of the single-band tight-binding model. The spin-dependent conductance was calculated from the Kubo formula by means of a recursion Green function technique, and the thermoelectric power directly from the well-known Onsager relations. In general, the observed oscillations may have either just one or two periods. In the latter case the long period of oscillations, related to spectacular beats, is apparently of non-RKKY type. The relative thermoelectric power oscillations are strongly enhanced in comparison with those of the giant magnetoresistance, have the same periods, but different phases and a negative bias.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 1; 221-224
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of Nanocrystalline Co/Ti and Co/Zr Multilayers
    Autorzy:
    Smardz, L.
    Smardz, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013147.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.-i
    75.30.Et
    Opis:
    It is shown that the Co sublayers grow in the soft magnetic nanocrystalline phase up to a critical thickness d≈3 and 2.8 nm for Co/Ti and Co/Zr MLs, respectively. The rapid decrease in the interlayer exchange coupling could be explained by its strong damping due to formation of a non-magnetic quasi-amorphous Co-Ti and Co-Zr alloy layer at the interfaces. The nanocrystalline 2.2 nm-Co/2 nm-Ti ML shows a weak 90° coupling near the transition zone from ferromagnetic to zero coupling.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 511-514
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties and GMR of Sputtered Permalloy/Au Multilayers
    Autorzy:
    Szymański, B.
    Stobiecki, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013183.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.-i
    75.70.Pa
    68.55.-a
    Opis:
    We report on structural, magnetic, and GMR properties of permalloy/Au multilayers where permalloy = Ni$\text{}_{83}$Fe$\text{}_{17}$, deposited by face-to-face sputtering onto Si(111) substrate. X-ray diffraction studies confirmed a good structural quality of our multilayers. The samples were characterised with vibrating sample magnetometer, longitudinal magnetooptical Kerr effect and giant magnetoresistance measurements. It was determined that our multilayers are magnetically very soft with H$\text{}_{c}$ ≈ 1 Oe and show uniaxial anisotropy with H$\text{}_{K}$ ≈ 5 Oe. For gold sublayer thickness d$\text{}_{Au}$ close to 1.1 nm the antiferromagnetic coupling is present in very narrow Au thickness range (≈ 0.2 nm). Despite a good structural quality of samples relatively small giant magnetoresistance value (1.2% at room temperature) was found. It is due to non-perfect aniferromagnetic coupling caused by pinholes.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 535-538
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Growth and Structural Characterisation of V/Fe Multilayers
    Autorzy:
    Marczyńska, A.
    Skoryna, J.
    Szymański, B.
    Smardz, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1387036.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.-i
    68.55.-a
    Opis:
    The (110) oriented V/Fe multilayers were prepared at room temperature using UHV magnetron sputtering. As a substrate we have used Si(100) wafers with an oxidised surface. The surface chemical composition and the cleanness of all layers was checked in situ, immediately after deposition, transferring the samples to an UHV analysis chamber equipped with X-ray photoelectron spectroscopy. The structure of the multilayers has been studied ex situ by low- and high-angle X-ray diffraction. The modulation wavelength was determined from the spacing between satellite peaks in the X-ray diffraction patterns. Results were consistent with the values obtained from total thickness divided by the number of repetitions. Growth of the Fe (V) on 1.6 nm V (Fe) underlayer was studied by succesive deposition and X-ray photoelectron spectroscopy measurements starting from 0.2 nm of Fe (V) layer, respectively. From the exponential variation of the X-ray photoelectron spectroscopy Fe 2p and V 2p integral intensities with increasing layer thickness we conclude that the Fe and V sublayers grow homogeneously in the planar mode.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 552-554
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Strong and Weak Interlayer Exchange Coupling in V/Fe Multilayers
    Autorzy:
    Marczyńska, A.
    Skoryna, J.
    Smardz, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1377826.pdf
    Data publikacji:
    2014-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.-i
    68.55.-a
    Opis:
    The $d_{V}-V$/0.6 nm-Fe multilayers with constant thickness sublayers were prepared onto naturally oxidised Si(100) substrate using UHV (5× $10^{-10}$ mbar) DC/RF magnetron sputtering. Results showed that the saturation field of the V/Fe multilayers oscillate with antiferromagnetic interlayer exchange coupling peaks near the V spacer thickness of about 1.3, 1.6, 2.05 nm. Furthermore, all the samples with vanadium layer thickness near local maxima of the antiferromagnetic coupling show zero remanence. The short period of the antiferromagnetic peak oscillations is due to indirect Ruderman-Kittel-Kasuya-Yosida (RKKY)-type coupling of the Fe layers across vanadium spacer. The absence of the antiferromagnetic peaks in the very strongly coupled region (below $d_{V}$ ≈ 1 nm) could be explained by direct ferromagnetic exchange coupling of the Fe layers due to magnetic polarization of V atoms near V-Fe interface.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 6; 1315-1317
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and Magnetic Properties of Ni/Ti Multilayers
    Autorzy:
    Szymański, B.
    Stobiecki, F.
    Otto, T.
    Röll, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1953189.pdf
    Data publikacji:
    1997-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    75.70.-i
    Opis:
    We report a study of structure and magnetic properties of Ni/Ti multilayers with different modulation wavelength, 10 nm ≤ λ ≤ 40 nm, and constant sublayers thickness ratio d$\text{}_{Ni}$/d$\text{}_{Ti}$=1. Specimens were characterized with X-ray diffraction, vibrating sample magnetometer and torque meter in as-deposited state and in successive stages of isothermal annealing at 423 K. Hysteresis curves of as-deposited samples revealed the typical feature of ferromagnetic films with predominant shape anisotropy. During annealing very pronounced changes in the hysteresis loops were observed. An analysis of the loops indicates the occurrence of distinct changes in magnetic anisotropy of Ni sublayers: their effective shape anisotropy is drastically reduced due to a development of the perpendicular anisotropy and/or a modification of the microstructure. The effect can possibly be applied to achieve desirable variation of perpendicular anisotropy in multilayers which consist of Ni sublayers.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 1; 233-236
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Superparamagnetic Grains as Source of Giant Magnetoresistance Effect in Discontinuous Co/Ag Multilayers
    Autorzy:
    Luciński, T.
    Stobiecki, F.
    Dubowik, J.
    Czajka, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955447.pdf
    Data publikacji:
    1997-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.Cn
    Opis:
    The as-deposited and annealed Co/Ag discontinuous multilayer-like structures were examined. Discontinuous Co sublayers are thought to consist of fine superparamagnetic and ferromagnetic grains. Using the bimodal superparamagnetic grain sizes distribution the GMR(H) dependencies were successfully modelled with the use of two Langevin functions simulating the magnetization of the superparamagnetic grains.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 2; 269-272
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interlayer Exchange Coupling in Nb/Fe Multilayers
    Autorzy:
    Marczyńska, A.
    Pugaczowa-Michalska, M.
    Szymański, B.
    Majchrzycki, Ł.
    Smardz, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030764.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.-i
    68.55.-a
    Opis:
    The (110) oriented Nb-Fe multilayers (MLs) with constant Fe and variable Nb sublayer thicknesses were prepared at room temperature using UHV magnetron sputtering. The artificial periodicity was revealed by intense satellite peaks in the low- and high-angle X-ray diffraction patterns. Magnetic hysteresis loop measurements at 5 K revealed antiferromagnetic (AF) exchange coupling of the Fe sublayers for Nb spacer thickness of about 3 monolayers. The corresponding AF coupling energy is equal to about -1.36 mJ/m². The Nb spacer thickness corresponding to the position of the AF peak is in good agreement with ab-initio calculations within localized spin density approximations of exchange-correlation potential.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 605-608
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrodeposition and Characterization of Co/Cu Multilayers
    Autorzy:
    Haciismailoglu, M.
    Alper, M.
    Kockar, H.
    Karaagac, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398770.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.De
    75.50.Cc
    75.70.Cn
    Opis:
    Co/Cu multilayers having different bilayer number (total thickness) were electrodeposited on polycrystalline Cu substrates with a strong [100] texture from an electrolyte including Co and Cu ions under potentiostatic control. The structural data from X-ray diffraction (XRD) revealed that all films have face-centered cubic (fcc) structure, but their crystal textures change from [100] to [111] as the bilayer number increases. The magnetic analysis by vibrating sample magnetometer (VSM) showed that the magnetic moment per volume decreases as the bilayer number increases. Magnetoresistance (MR) measurements were made at room temperature in the magnetic fields of ± 12 kOe using the Van der Pauw (VDP) method with four probes. The samples with the bilayer number less than 111 exhibited giant magnetoresistance (GMR) with a negligible amount of anisotropic magnetoresistance (AMR), while the ones with the bilayer number larger than 111 have pure GMR effect.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 773-775
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exchange Coupling and Magnetization Profiles of Binary and Ternary Magnetic Multilayers
    Autorzy:
    Süss, F.
    Krey, U.
    Krompiewski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955456.pdf
    Data publikacji:
    1997-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.Cn
    75.70.-i
    Opis:
    Within a spin-polarized LMTO approach in the atomic-sphere approximation we calculate ab initio the magnetic properties of various binary and ternary multilayers composed of Fe, Co, Ni, Cr, V and Cu. The emphasis lies on the indirect exchange interaction of the magnetic sandwiches across the antiferromagnetic or non-magnetic spacers, and on the profiles of the intrinsic resp. induced magnetic moments. Among other results we find (i) that Ni is very sensitive on its neighborhood and that (ii) at the interface to Fe, V gets almost as strongly polarized as Cr, whereas in the interior layers, the V sandwich remains non-polarized.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 2; 281-284
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    From Monoatomic Multilayers To Ordered Alloys
    Autorzy:
    Korecki, J.
    Kubik, M.
    Spiridis, N.
    Ślęzak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2011233.pdf
    Data publikacji:
    2000-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.Cn
    75.50.Bb
    76.80.+y
    Opis:
    Recent progress in UHV preparation and characterization methods resulted in a large variety of novel materials. Among them, magnetic multilayers have become one of the mostly investigated system due to interesting phenomena like oscillating indirect exchange coupling, spin dependent electron transport, or large perpendicular anisotropies. An attractive possibility given by the molecular beam epitaxy is to grow the multilayer structures on atomic scale by the so-called atomic layer deposition. At the low thickness limit, a multilayer structure, in which few atomic layers of different metals are stacked alternately, is expected to be an artificial ordered alloy. Such artificial material, which does not exist in the equilibrium bulk phase, was constructed for the first time as the AuFe ordered alloy of the L1$\text{}_{0}$ structure. Our conversion electron Mössbauer spectroscopy studies of this system verified the existence of the tetragonal phase, which is responsible for the perpendicular anisotropy. The ordering process is influenced by the complicated growth of Fe on Au, as shown by the atomic scale scanning tunneling microscopy investigations. Other systems to be presented are FeAl (strong ordering mechanism in the bulk) and FeCr (miscible in the wide concentration range) monoatomic
    Źródło:
    Acta Physica Polonica A; 2000, 97, 1; 129-139
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theory for Temperature Induced Magnetic Reorientation in Thin Films and Multilayers
    Autorzy:
    Jensen, P. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964795.pdf
    Data publikacji:
    1997-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Gw
    75.10.Hk
    75.70.Ak
    Opis:
    The temperature driven reorientation of the magnetization observed in thin ferromagnetic films and multilayer systems is studied theoretically. We take into account layer dependent magnetic anisotropies. The free energy and the direction of magnetization are calculated by using a perturbational approach as well as a nonperturbational treatment. It is shown that in most cases a continuous magnetic reorientation is obtained. An increasing anisotropy energy as compared to the exchange interaction leads to an increasing width of the magnetic reorientation.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 2; 427-431
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Correlated Roughness Effects in the Giant Magnetoresistance of Magnetic Multilayers
    Autorzy:
    Palasantzas, G.
    Barnaś, J.
    De Hosson, J. Th. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013095.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.15.Gd
    73.40.Jn
    Opis:
    Interface roughness effects on the giant magnetoresistance in magnetic multilayers are analysed theoretically for structures with non-conformal correlated interfaces. The roughness of each interface is described in terms of the K-correlation model and is characterized by the roughness exponent H(0≤H<1), correlation length ξ, and rms roughness amplitude Δ. Coherent scattering by different interfaces is also taken into account.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 495-498
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal modeling of planar and cylindrical biomedical multilayers structures in frequency domain
    Autorzy:
    Strąkowska, Maria
    Więcek, Bogusław
    Powiązania:
    https://bibliotekanauki.pl/articles/114518.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    thermal models
    Vector Fitting
    perfusion
    Pennes model
    Foster network
    Opis:
    Planar and cylindrical thermal models of biomedical multilayer structures with perfusion are presented in this paper. For each layer the models are solved analytically in frequency domain using the Laplace transform. Modeling the multilayer structure allows formulating the set of linear equations with unknown integral constants. As a result, the thermal impedance Zth(jω) is calculated. Next, the poles of thermal impedance are estimated using Vector Fitting (VF) method. Finally, distribution of thermal time constants allows evaluating the temperature response T(t) of the modeled structure.
    Źródło:
    Measurement Automation Monitoring; 2019, 65, 2; 32-36
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and Magnetism of LSMO/BTO/MgO/LSMO Multilayers
    Autorzy:
    Pawlak, J.
    Żywczak, A.
    Szwachta, G.
    Kanak, J.
    Gajewska, M.
    Przybylski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030441.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.60.Ej
    Opis:
    A multiferroic tunnel junction (MFTJ) is a promising device for future memory systems with discrete and different logic states which are controlled by a combination of electric and magnetic fields. The goal of ongoing research is to present ferroelectric and ferromagnetic properties, especially at room temperature (RT), represented as high values of tunnel electroresistance (TER) and tunnel magnetoresistance (TMR). A key aspect is the appropriate preparation of a sample allowing epitaxial growth. The thin layers were prepared by pulsed laser deposition on atomically smooth monocrystalline SrTiO₃ (STO) substrates. The ferromagnetic metal layers La_{0.67}Sr_{0.33}MnO₃ (LSMO) are separated by a layer of a ferroelectric insulator - BaTiO₃ (BTO). The same structure of LSMO, BTO and STO (perovskite) and a similar lattice constant make it possible to obtain high-quality heterostructures. Magnetic measurements confirm differences in the magnetic coercivity of the top and bottom LSMO layer, which allows to obtain their parallel and antiparallel magnetization orientation. A modification of the interfaces of BTO by thin MgO layer enables an increase in the value of the TER effect.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 548-551
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetism and Magnetoresistance of Multilayers Prepared on Microstructured Substrates
    Autorzy:
    Shinjo, T.
    Ono, T.
    Shigeto, K.
    Sugita, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/1953110.pdf
    Data publikacji:
    1997-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    85.30.Vw
    75.70.Pa
    75.70.-i
    Opis:
    Magnetic multilayers with a new type of structural modification were prepared by ultrahigh vacuum deposition onto substrates with V-shaped microgrooves and used as the samples for the following two novel studies: One is the study of giant magnetoresistance in a new geometry, CAP, where the electric current is at a certain angle to interfaces. Enhancement of magnetoresistance in CAP geometry, in comparison to the normal current in-plane magnetoresistance, was confirmed. The other is the study of magnetic thin wires, which were prepared by depositing in a tilted direction to the surface. A preliminary result of magnetization reversal investigation is presented.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 1; 27-36
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetisation and hydrogenation of Mg/Ni multilayers
    Autorzy:
    Pacanowski, S.
    Marczyńska, A.
    Dawczak-Dębicki, H.
    Jabłoński, B.
    Szymański, B.
    Smardz, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1048263.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.Cn
    61.10.Nz
    Opis:
    In this contribution we have studied magnetisation of Mg/Ni multilayers (MLs) to characterise the alloing effect near interfaces. The layered structure was characterised by standard X-ray diffraction. The MLs were deposited by UHV magnetron sputtering onto naturally oxidised Si(100) substrates. Results showed, that due to Mg-Ni alloy formation near interfaces the magnetizations of the MLs were strongly reduced. Effective "dead" Ni layer thickness was estimated as 1.2 nm at room temperature (RT). Furthermore, hydrogen absorption kinetics at a pressure of about 1000 mbar was studied at RT in Pd covered Mg/Ni MLs using four-point resistivity measurements. Results showed that the fastest initial rise in resistance in the first 9 s was observed for d_{Ni}=3.5 nm.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 617-619
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computer Controlled System for the Magnetron Sputtering Deposition of the Metallic Multilayers
    Autorzy:
    Marszałek, K.
    Stępień, J.
    Mania, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/226224.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    process control system
    Al-Ni
    magnetron sputtering
    Opis:
    Deposition of the metallic multilayers is a part of the scientific program on the chemical reaction leading to intermetallic compound formation. This reaction is known as self propagation high temperature synthesis (SHS). The key problem in this investigation is to produce the metallic multilayer system with good repeatability of thin films thicknesses. Thin should be thin, parallel and with low volume of intermixing region between components. Computer control system for the pulsed (mid frequency MF) magnetron sputtering equipment dedicated for metallic multilayers deposition is presented in this paper. The rotation velocity of the sample holder and the gas inlet through membrane valves are the main parameters controlled by the system. Parameters of the magnetron gun power supply, sample temperature and technological gas pressure are registered. The process cards which define all process parameters are collected for each dedicated process type. All cards are collected in a process cards library which permits for full automatization of all operations. Software was written in a graphical LabVIEW environment.
    Źródło:
    International Journal of Electronics and Telecommunications; 2014, 60, 4; 291-298
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spin Waves in Antiferromagnetically Coupled Multilayers
    Autorzy:
    Mingozzi, M.
    Donzelli, O.
    Ngaboyisonga, J. M. V.
    Nizzoli, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1953181.pdf
    Data publikacji:
    1997-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Pd
    75.70.Cn
    75.70.-i
    Opis:
    We investigate how the static and dynamical magnetic properties of Fe/Cr finite superlattices with antiferromagnetic coupling depend on the ratio between the uniaxial anisotropy constant and the interlayer exchange constant of Fe films. The spin waves are calculated by considering dipole interaction, intralayer and interlayer exchange coupling, uniaxial anisotropy, in presence of an external field. The calculated spectra are compared with recent experimental Brillouin scattering data which exhibit two spin waves peaks.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 1; 213-216
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Anisotropy Distribution in NiFe/Au/Co/Au Multilayers
    Autorzy:
    Dubowik, J.
    Stobiecki, F.
    Gościańska, I.
    Kociemba, M.
    Bednarski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810556.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.21.Ac
    75.30.Gw
    76.50.+g
    Opis:
    We present results of FMR investigations of anisotropy distribution in uncoupled $[NiFe/Au/Co/Au]_N$ structures with alternating in-plane (NiFe) and out-of-plane anisotropies (Co). It is concluded that for NiFe layers anisotropy distribution is negligible and can be increased by "dusting" of NiFe with ultrathin Co layers. The perpendicular anisotropy $K_{U}^2$ of Co layers depends on Co thickness in a standard way ∝ 1/$d_{Co}$, and is distributed in a range of ≈10-20% of $K_{U}^2$ (i.e., ≈ 1.5× $10^6$ erg/$cm^3$).
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 315-318
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interface Mixing in Fe/Si Multilayers Observed by the In Situ Conductance Measurements
    Autorzy:
    Chomiuk, P.
    Błaszyk, M.
    Szymański, B.
    Luciński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810582.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.40.Sx
    73.50.-h
    Opis:
    In this contribution the in situ conductance vs. deposition time dependences of Fe/Si multilayers are analysed. The plot of resistance multiplied by the square of the thickness as a function of iron thickness shows that during the iron deposition initially amorphous-like Fe-Si mixture is formed, next the mixture crystallises, and finally bcc-Fe phase appears. The interface mixing is also manifested by the reduction of the total multilayer thickness measured by small angle X-ray diffraction.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 355-356
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Anisotropy and Magnetostriction Oscillations in Magnetic Multilayers
    Autorzy:
    Szymczak, H.
    Żuberek, R.
    Stobiecki, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/2011101.pdf
    Data publikacji:
    1999-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.Ha
    75.70.-i
    75.70.Cn
    75.80.+q
    Opis:
    Interlayer pseudodipolar coupling between two ferromagnets separated by nonmagnetic spacer is analyzed. It was shown that this type of interaction should induce magnetic anisotropy and magnetostriction oscillations. It was also predicted that both magnetic anisotropy and magnetostriction decrease with an increase in the spacer thickness. This effect was observed in [permalloy/Cu]$\text{}_{100}$ multilayers.
    Źródło:
    Acta Physica Polonica A; 1999, 96, 3-4; 495-499
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transmission Spectra of Thue-Morse Multilayers Containing Negative Index Metamaterials
    Autorzy:
    Maksimovic, M.
    Jaksic, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047879.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.Qs
    71.36.+c
    71.55.Jv
    78.20.Ci
    Opis:
    We study the optical transmission spectra in one-dimensional aperiodic Thue-Morse multilayers composed from alternating layers of media with positive and negative refractive index. We examine the influence of phase compensation on the spectral transmission for both on-axis and off-axis wave propagation. The origin of the transmission resonances and their relation with the field localization are analyzed. Nondispersive and lossless, as well as realistic dispersive and weakly lossy materials are considered.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 1049-1054
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interlayer Exchange Coupling and Proximity Effect in V-Fe Multilayers
    Autorzy:
    Marczyńska, A.
    Synoradzki, K.
    Pugaczowa-Michalska, M.
    Toliński, T.
    Smardz, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030414.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.-i
    68.55.-a
    Opis:
    We have studied interlayer exchange coupling (IEC) in (110) oriented V/Fe multilayers with ultrathin sublayers up to 7 monolayers (ML). Results showed that IEC energy depends on both vanadium and iron layer thicknesses. The local maxima of the antiferromagnetic coupling were found for V(7 ML)/Fe(4 ML) and V(3 ML)/Fe(3 ML) multilayers (MLs). The strongest AFM coupling energy of about 1.0 mJ/m² was measured at 5 K for the V(7 ML)/Fe(4 ML) multilayer. The position of the AFM peak for V(X ML)/Fe(3 ML) MLs near 3 ML of V spacer was also revealed by ab-initio calculations. Furthermore, theoretical calculations show an induced negative magnetic moment on V atoms near the V-Fe and Fe-V interfaces due to the proximity effect.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 597-600
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On Current and Prospective Use of Binary Thin Multilayers in Radar Absorbing Structures
    Autorzy:
    Kapelewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399359.pdf
    Data publikacji:
    2013-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.55.Nv
    81.07.Oj
    77.84.Lf
    84.40.-x
    Opis:
    The main objective of the paper is to overview of the actual and potential capabilities of some complex multilayers to enhance, and control the microwave absorption. Going through available literature data we emphasize the role of interphase coupling, and material resonances in enhancing phenomena of importance for internal scattering, diffusions, and intrinsic material absorption of propagating EM wave, especially in microwave and mm wave ranges. The theoretical background is consequently formulated in terms of transmissions line approach.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 3; 451-455
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of Unsaturation Domain Formation in Antiferromagnetic Multilayers
    Autorzy:
    Major, M.
    Bottyán, L.
    Nagy, D. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2030438.pdf
    Data publikacji:
    2002-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.Kw
    75.40.Mg
    78.20.Ls
    75.25.+z
    Opis:
    A two-dimensional phenomenological model of patch-domain formation on unsaturation in strongly coupled tri- and multilayer antiferromagnets is presented. Domain patterns are simulated using a fast Monte Carlo algorithm. As a first example the autocorrelation function of the simulated domain pattern is compared with that of a measured Kerr image.
    Źródło:
    Acta Physica Polonica A; 2002, 101, 2; 301-305
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimizing recovery factor in multilayers mature gas field, based on decline curve analysis methodology
    Autorzy:
    Stefanescu, D. P.
    Iturbe, Y.
    Falk, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/299016.pdf
    Data publikacji:
    2014
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    mature gas fields
    Laslau Mare field
    recovery factor
    Opis:
    Generally, the mature fields have a good portion of the remaining reserves still trapped due to inefficient drainage, pressure decline, inerease in water cut, sand production and aging of the existing system. This paper addresses a methodology applied on the historical produetion behavior to identify techniques and initiatives to optimize the recovery factor based on redevelopment plans in a mature field. For Laslau Mare field in particular, there have been identified and implemented opportunities such as: infill drilling, work over optimization, dynamie underbalance perforation (DUP), acidizing, kick off with N2, propellant stimulation, snubbing, soaping, sand management, Wavefront Technology stimulation and wellhead and/or group compressor installation.
    Źródło:
    AGH Drilling, Oil, Gas; 2014, 31, 2; 367-393
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Néels Magnetostatic Coupling in Sputtered Cu/Py/V/Py/MnIr/Cu Multilayers
    Autorzy:
    Urbaniak, M.
    Brückl, H.
    Stobiecki, F.
    Luciński, T.
    Reiss, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037183.pdf
    Data publikacji:
    2004-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.Cn
    68.65.Ac
    Opis:
    The correlation between magnetostatic or Néel's coupling and roughness of interfaces in sputtered Cu/Py/V/Py/MnIr/Cu multilayers was investigated with the help of atomic force microscopy and magnetometry. It is shown that the coupling strongly depends on the roughness of seed Cu layer which in turn depends on sputtering power. Roughness levels off after deposition of consecutive layers to about 0.2 nm rms.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 3; 307-313
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Giant Magnetoresistance of $[Ni_{80}Fe_{20}/Au/Co/Au]_{N}$ Multilayers Deposited on Flexible Substrates
    Autorzy:
    Gospodarczyk, W.
    Urbaniak, M.
    Stobiecki, F.
    Szymański, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1428620.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.De
    75.70.Cn
    Opis:
    Magnetic hysteresis and magnetoresistance of $[Ni_{80}Fe_{20}/Au/Co/Au]_{10}$ multilayers displaying giant magnetoresistance and sputtered on a flexible polypropylene substrates (an adhesive tape) is investigated. The magnetoresistive properties are very similar to those found in films prepared under the same conditions on Si(100) substrates. It is demonstrated, too, that a bendability of the substrates can be utilized to form cylindrically shaped magnetoresistive sensors with reduced anisotropy of the effect.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1234-1236
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization and Application of Al/Ni Reactive Multilayers in Exploding Foils
    Autorzy:
    Wang, T.
    Zeng, Q.
    Li, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/358516.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    energetic material
    Al/Ni reactive multilayer foils
    bilayer thickness
    exploding foil initiator
    Opis:
    A self-propagating reaction achieved by initiating an Al/Ni reactive multilayer foil can generate significant heat. The interdiffusion rate of the reactants plays an important role in the foils properties and is mainly affected by premixing and the bilayer thickness. The present research aims to characterize Al/Ni multilayer foils and to investigate their influence on an exploding foil initiator. Samples with different bilayer thicknesses were fabricated by magnetron sputtering. The heat released and the flame velocity were characterized. Foils with a stored energy of about 1100 J/g were prepared and the heat released revealed the existence of a 4 nm premixing layer. The analytical model proposed by Mann was employed to match the measured flame velocities; the fitted model showed good agreement with the experimental results. To make a comparison, Cu and Al/Ni exploding foils with the same bridge size were fabricated and tested in the identical discharge circuit. The results showed that the energy deposition ratio of an Al/Ni foil was 67-69%, while the value for Cu was only 39-45%, which indicated that Al/Ni multilayers could effectively increase the energy utilization of an initiator. Larger average flyer velocities were also observed with the Al/Ni initiators.
    Źródło:
    Central European Journal of Energetic Materials; 2017, 14, 3; 547-558
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    In Situ Conductance of Fe/Si and Fe/Ge Multilayers
    Autorzy:
    Chomiuk, P.
    Błaszyk, M.
    Luciński, T.
    Wróblewski, M.
    Susła, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813491.pdf
    Data publikacji:
    2008-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.40.Sx
    73.50.-h
    75.70.Cn
    Opis:
    In this paper we study Fe/Si and Fe/Ge multilayers prepared at room temperature by magnetron sputtering. In situ conductance measurements reveal the formation of interfacial Fe-Si and Fe-Ge mixtures. During the Fe deposition a modification of growth mode is noticed. Deposition of Si (or Ge) onto Fe leads to the reduction of the Fe layer thickness due to interdiffusion, and Fe-Si (or Fe-Ge) structures appear. Above about 1.3 nm of deposited Si (1.5 nm of Ge) nominally pure Si (Ge) starts growing. Surface topography of the Fe/Si multilayers is studied by atomic force microscopy.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 2; 657-662
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    X-Ray Resonant Magnetic Scattering: Application to Thin Films and Multilayers
    Autorzy:
    Raoux, D.
    Jaouen, N.
    Tonnerre, J. M.
    Bontempi, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014370.pdf
    Data publikacji:
    2000-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.28.+d
    78.70.Ck
    71.27.+a
    Opis:
    This paper reports on the use of a new technique to investigate the magnetic properties of thin films, multilayers and artificial structures, the X-ray resonant magnetic scattering at small values of the scattering vector. It can be used either by registering the reflectivity pattern or in a diffraction mode. In comparison with magneto-optical Kerr effect or neutron scattering, it offers an atomic selectivity due to the resonant excitation of a core electron, and even an electronic shell one. Examples are presented mainly in the soft X-range allowing to probe the 3d band of transition metals. They demonstrate the promising possibilities of the method to measure the magnetic moments carried by each of the atomic components in complex systems, as well as their distribution through thin layers, with an atomic resolution.
    Źródło:
    Acta Physica Polonica A; 2000, 98, 5; 483-494
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and Magnetism of MBE-Grown Co/Cu Multilayers
    Autorzy:
    Baczewski, L. T.
    Wawro, A.
    Domagała, J.
    Pełka, J.
    Szewczyk, A.
    Nabiałek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955475.pdf
    Data publikacji:
    1997-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Gw
    75.30.-m
    75.70.-i
    Opis:
    Structural and magnetic properties of Co/Cu multilayers deposited in the ultra-high vacuum molecular beam epitaxy system on glass substrates with different modulations periods were investigated. A structural characterization was performed by means of RHEED and Auger spectroscopy (in situ), small angle X-ray reflectivity and scanning tunneling microscopy. The samples obtained have a textured, polycrystalline layered structure for deposition at room temperature. Magnetization and in-plane magnetoresistance measurements were performed as a function of Cu and Co layer thicknesses. An influence of different buffers and of interface quality on magnetic properties was investigated.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 2; 315-319
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Complex Magnetic Structure of Strongly Coupled Fe/Si Multilayers
    Autorzy:
    Dubowik, J.
    Stobiecki, F.
    Szymański, B.
    Kudryavtsev, Yu. V.
    Grabias, A.
    Kopcewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013056.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.-i
    68.55.-a
    76.50.+g
    Opis:
    Fe/Si multilayers with strong bilinear and biquadratic couplings were investigated. A complex structure revealed by the Mössbauer spectroscopy corresponds to multimode ferromagnetic resonance spectra in a non-saturated state. Simple dispersion relations for antiferromagnetic coupled bilayer structures are shown to be inapplicable to the Fe/Si multilayers with a strong biquadratic component to the antiferromagnetic bilinear coupling.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 451-454
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural Studies of Titanium Oxide Multilayers
    Autorzy:
    Karwasz, G. P.
    Miotello, A.
    Zomer, E.
    Brusa, R. S.
    Kościelska, B.
    Armellini, C.
    Kuzmin, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043379.pdf
    Data publikacji:
    2005-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.47.Jk
    78.70.Bj
    61.10.Nz
    Opis:
    Multilayers of titanium oxide on conductive glasses (silica, covered with indium/tin and tin oxides) were obtained by different methods (from suspension, by sol-gel, by vacuum sputtering). X-ray diffraction and positron annihilation depth-resolved characterization of these samples are presented. The data allow us to determine optimal deposition parameters, in order to obtain the anatase phase, important in practical applications in photoelectrochemical cells.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 6; 977-982
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Contribution of TiN/Ti/a-C:H multilayers architecture to biological and mechanical properties
    Autorzy:
    Major, L.
    Lackner, J. M.
    Kot, M.
    Janusz, M.
    Major, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/200944.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    microstructure
    smooth muscle cells adhesion
    cracking
    Opis:
    Complex microstructure analysis of TiN/Ti/a-C:H multilayer coatings, subjected to mechanical and biological tests, were performed by means of transmission electron microscopy (TEM) and confocal scanning laser microscopy (CSLM), respectively. Influence of interface numbers and phase ratios on coating properties was studied. Thin films were fabricated by a hybrid PLD technique (PLD supported by magnetron sputtering). The a-C:H phase was characterized by an amorphous structure, while TiN was built of columnar crystallites. Multilayer coatings contained sequentially deposited TiN and a-C:H layers with thin metallic Ti inter- layers deposited at each interface. Mechanisms of mechanical wear of analyzed systems were presented focusing on the cracking propagation revealed in the scratch test. Biological tests were done basing on smooth muscle cells adhesion to coating surfaces. An increase of TiN phase in the coating led to improvement of mechanical properties, while the carbon phase improved the biological behavior. Coatings comprising a higher rate of the carbon (a-C:H) revealed brittleness and were prone to delaminating. Optimal properties from the mechanical and biological point of view were stated for 8xTiN/Ti/a-C:H coating with 1:1 phase ratio (TiN to a-C:H).
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 3; 565-570
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    One dimensional phononic FDTD algorithm and transfer matrix method implementation for Severin aperiodic multilayer
    Autorzy:
    Garus, S.
    Sochacki, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/122705.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    phononic
    FDTD
    transfer marix
    aperiodic
    multilayers
    właściwości transmisyjne
    urządzenia akustyczne
    aperiodyczna supersieć
    Severin
    Opis:
    In this paper, the power spectrum and phononic properties of the quasi one-dimensional Severin aperiodic multilayer was investigated. Multilayer phononic structures with their phononic band gap properties can be used as filters of mechanical waves. In the paper, the implementation of the Finite Difference Time Domain (FDTD) algorithm with discrete Fourier transform and the Transfer Matrix Method algorithm in the Wolfram Language in Mathematica was made.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2017, 16, 4; 17-27
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Temperature and Annealing on GMR in Sputtered Permalloy/Cu Multilayers
    Autorzy:
    Urbaniak, M.
    Stobiecki, F.
    Luciński, T.
    Kopcewicz, M.
    Grabias, A.
    Aleksiejew, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013168.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.Ak
    75.70.Pa
    Opis:
    The influence of temperature and annealing on giant magnetoresistance of Si(100)/Cu(20 nm)/Py(2 nm)/(Cu(2 nm)/Py(2 nm))$\text{}_{100}$ multilayer (Py = Ni$\text{}_{83}$Fe$\text{}_{17}$) sputtered at room temperature in double face-to-face configuration is reported. It was found that giant magnetoresistance value, ΔR$\text{}_{GMR}$/R$\text{}_{sat}$ (where R$\text{}_{sat}$ is the resistance in saturation), monotonically decreases with increasing temperature (4.5% at 173 K to about 1% at 373 K). This results from the decrease in magnetic change of resistance, ΔR$\text{}_{GMR}$, and to the lesser extent from an increase in R$\text{}_{sat}$, though both of them are caused by the shortening of electrons mean free path. The observed almost linear decrease in giant magnetoresistance saturation field with increasing temperature is explained by temperature changes of magnetization profile. Vibrating sample magnetometer measurements revealed that the increase in temperature results in pronounced decrease in remnant to saturation magnetization ratio (M$\text{}_{r}$/M$\text{}_{s}$) suggesting that at low temperatures magnetic bridges between Py layers play an important role in magnetization process. It is shown that proper annealing, by an annihilation of bridges and/or lateral decoupling, leads to an increase in giant magnetoresistance ratio from 3.4% in as deposited state to 4.7%.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 539-542
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    STM/AFM Observations of Co/Cu Magnetic Multilayers
    Autorzy:
    Aleszkiewicz, M.
    Kalinowski, R.
    Czajka, R.
    Polewska, W.
    Wawro, A.
    Baczewski, L. T.
    Raułuszkiewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955472.pdf
    Data publikacji:
    1997-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.16.Ch
    68.65.+g
    68.55.Jk
    Opis:
    UHV deposited magnetic Co/Cu multilayers were investigated by means of scanning tunneling microscopy (STM) and atomic force microscopy (AFM). Surface of the sample i.e. upper covering layer in "plane" configuration and individual sublayers in "cross-section" configuration were investigated. A possibility of structure characterization of metallic multilayers by STM and AFM in the cross-section configuration is demonstrated.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 2; 311-314
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy-Dispersive X-Ray Reflectometry and X-Ray Grazing Incidence Diffraction from Organic Multilayers
    Autorzy:
    Neißendorfer, F.
    Bolm, A.
    Pietsch, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/1963393.pdf
    Data publikacji:
    1997-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.18.+p
    61.10.Kw
    68.55.Jk
    07.85.Qe
    Opis:
    The installation of the wavelength shifter at the BESSY I storage ring in Berlin makes it possible to apply the synchrotron radiation for white beam investigations of organic multilayers. Considering the energy characteristic of the synchroton radiation source and the absorbance of the beryllium window the synchrotron radiation can be used outside the UHV system for X-ray reflectometry and X-ray diffuse scattering between about 3 keV and 25 keV. Between 3 and 10 keV the synchrotron radiation intensity is high enough to realize the grazing incidence diffraction mode in order to get in-plane information. The capability of the methods is demonstrated at the example of a Pb-stearate multilayer covered by a thin polyelectrolytic polymer layer.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 4; 829-833
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A semi-analytical solution of thick truncated cones using matched asymptotic method and disk form multilayers
    Półanalityczne rozwiązanie dla grubościennej powłoki stożka ściętego wykorzystujące dopasowaną metodę asymptotyczną i podział na warstwy krążkowe
    Autorzy:
    Nejad, M. Z.
    Jabbari, M.
    Ghannad, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/139739.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    shear deformation theory (SDT)
    thick truncated cone
    disk form multilayers
    matched asymptotic method (MAM)
    teoria odkształceń pierwszego rzędu
    stożek cięty o grubościennej powłoce
    warstwy krążkowe
    dopasowana metoda asymptotyczna MAM
    Opis:
    In this article, the thick truncated cone shell is divided into disk-layers form with their thickness corresponding to the thickness of the cone. Due to the existence of shear stress in the truncated cone, the equations governing disk layers are obtained based on first shear deformation theory. These equations are in the form of a set of general differential equations. Given that the truncated cone is divided into n disks, n sets of differential equations are obtained. The solution of this set of equations, applying the boundary conditions and continuity conditions between the layers, yields displacements and stresses. The results obtained have been compared with those obtained through the analytical solution and the numerical solution. For the purpose of the analytical solution, use has been made of matched asymptotic method (MAM) and for the numerical solution, the finite element method (FEM).
    Grubościenna powłoka stożka ciętego, opisana w artykule, jest dzielona na warstwy w formie krążków o grubości odpowiadającej grubości powłoki. Ponieważ w stożku ściętym istnieją naprężenia ścinające, równania dla warstw krążkowych są otrzymane na bazie teorii odkształceń pierwszego rzędu. Równania te mają postać układu ogólnych równań różniczkowych. Zakładając, że stożek ścięty jest podzielony na n warstw, uzyskuje się układ n równań różniczkowych. Wartości przemieszczeń i naprężeń otrzymuje się w wyniku rozwiązania tego układu równań, przy uwzględnieniu warunków brzegowych i warunków ciągłości. Uzyskane wyniki porównano z wynikami rozwiązań analitycznego oraz numerycznego. Dla potrzeb rozwiązania analitycznego wykorzystano dopasowaną metodę asymptotyczną (Matched Asymptotic Method, MAM), a w rozwiązaniu numerycznym zastosowano metodę elementów skończonych (FEM).
    Źródło:
    Archive of Mechanical Engineering; 2014, LXI, 3; 495-513
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    AES Studies of Saturation in Surfactant Segregation Process in Co/Cu Multilayers
    Autorzy:
    Krupiński, M.
    Dobrowolska, A.
    Kąc, M.
    Polit, A.
    Zabila, Y.
    Marszałek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1539147.pdf
    Data publikacji:
    2010-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.80.Pv
    68.55.-a
    68.65.Ac
    Opis:
    The chemical composition of successive layers in a Co/Cu multilayered system was studied during growth with Auger electron spectroscopy. Experiments were carried out on a sample with 10 repetitions of Co(1 nm)/Cu(2 nm) evaporated at a very low deposition rate in ultrahigh vacuum. A very small amount of Bi or Pb (0.06 nm) was deposited on each Cu film in the system. The experimental data have shown that the concentration of Bi and Pb increases with the number of deposited trilayers up to coverage corresponding to 5 trilayers. At that point the concentration of the surfactant saturated. The changes in the surfactant concentrations are described with a simple model depicting the interaction of the surfactant atoms with the system and how the evolution of the segregation processes. It allows the prediction of the saturation concentration and helps to explain the behaviour of various elements used as a surfactant. The comparison between the theoretical predictions and the experimental results is also discussed.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 2; 420-422
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetization Studies of Antiferromagnetic Interlayer Coupling in EuS-SrS Semiconductor Multilayers
    Autorzy:
    Samburskaya, T.
    Sipatov, A.
    Volobuev, V.
    Dziawa, P.
    Knoff, W.
    Kowalczyk, L.
    Szot, M.
    Story, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400494.pdf
    Data publikacji:
    2013-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.Ck
    75.30.Et
    Opis:
    Temperature and magnetic field dependence of magnetization of EuS-SrS multilayers grown epitaxially on KCl (001) substrate is experimentally studied by superconducting magnetometry technique. In these lattice-matched semiconductor heterostructures EuS layers are ferromagnetic quantum wells whereas SrS layers are nonmagnetic spacer barriers. The multilayers composed of EuS layers with thickness 3.5-5 nm and SrS layers (thickness 0.5-10 nm) exhibit ferromagnetic transition at 17 K. In the multilayers with ultrathin SrS spacers (0.5-1 nm) a nonmonotonic temperature dependence of magnetization as well as a characteristic switching in magnetic hysteresis loops is observed. These experimental findings are explained considering antiferromagnetic interlayer coupling between ferromagnetic EuS layers via nonmagnetic SrS spacers. The strength of this coupling is determined based on model magnetization calculations.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 1; 133-136
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    MFM Investigations of $[NiFe//Au//Co//Au]_N$ Multilayers
    Autorzy:
    Bazarnik, M.
    Dabrowski, J.
    Czajka, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810474.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.21.Ac
    74.25.Ha
    75.30.Gw
    75.60.Ch
    75.70.-i
    75.70.Rf
    Opis:
    Magnetic force microscopy measurements combined with computer simulations were applied to investigate the strengths of magnetic field over the $[NiFe//Au//Co//Au]_N$ multilayers with in-plane and out-of-plane anisotropy observed for NiFe and Co layers, respectively. All measurements were performed in air atmosphere at room temperature. Dimensions and density of magnetic domains were estimated. The distribution of magnetization directions was deduced from comparison of magnetic force microscopy with the simulation results. Some sort of modulation in stray magnetic field was observed, but till now it is of unknown origin.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 220-222
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Grazing Incidence X-Ray Reflectivity Study of MBE-Grown Co/Cu Multilayers
    Autorzy:
    Pełka, J. B.
    Baczewski, L. T.
    Wawro, A.
    Domagała, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1963397.pdf
    Data publikacji:
    1997-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Gw
    75.30.-m
    75.70.-i
    Opis:
    In this work we report preliminary grazing-incidence X-ray reflectometry studies of multilayer structures composed of 3d metals Co and Cu deposited in the ultra-high vacuum molecular beam epitaxy system. The multilayers of different modulation period were deposited on glass substrate directly, or on 3d -metallic buffers of various thicknesses. The experimental specular reflectivity spectra were analyzed by a comparison with a theoretical model calculated from a recursive algorithm based on the Fresnel formula [1, 2]. It enabled us to estimate the structural parameters concerning layer thickness and roughness. The results obtained are correlated with magnetization measurements of the layered structures, as a function of modulation period, buffer type and thickness. A special attention to influence of interfacial roughness on magnetization results is paid.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 5; 859-863
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exchange Coupling in Magnetic Semiconductor Multilayers and Superlattices
    Autorzy:
    Furdyna, J.
    Leiner, J.
    Liu, X.
    Dobrowolska, M.
    Lee, S.
    Chung, J.
    Kirby, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1426668.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    61.05.fj
    75.47.De
    75.70.Cn
    Opis:
    The study of ferromagnetic semiconductors continues to be of great interest because of their potential for spintronic devices. While there has been much progress in our understanding of ferromagnetic semiconductor materials - particularly of the canonical III-V system $Ga_{1-x}Mn_xAs$ - many issues still remain unresolved. One of these is the nature of interlayer exchange coupling in GaMnAs-based multilayers, an issue that is important from the point of view of possible spintronic applications. In this connection, it is important to establish under what conditions the interlayer exchange coupling between successive GaMnAs layers is antiferromagnetic or ferromagnetic, since manipulation of such interlayer exchange coupling can then be directly applied to achieve giant magnetoresistance and other devices based on this material. In this review we will describe magneto-transport, magnetization, and neutron reflectometry experiments applied to two types of GaMnAs-based multilayer structures - superlattices and tri-layers - consisting of GaMnAs layers separated by non-magnetic GaAs spacers. These measurements serve to identify conditions under which AFM coupling will occur in such GaMnAs/GaAs multilayer systems, thus providing us the information which can be used for manipulating magnetization (and thus also giant magnetoresistance) in structures based on the ferromagnetic semiconductor GaMnAs.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 973-980
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure of metal oxide multilayers deposited by sol-gel method on surface of NiTi shape memory alloy
    Autorzy:
    Osak, P.
    Waś, J.
    Łosiewicz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1153876.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.40.Kc
    81.20.Fw
    62.20.fg
    Opis:
    The metal oxide layers were deposited onto the surface of NiTi shape memory alloy using sol-gel method. Single-, double- and triple-layers were obtained from a colloidal solution containing the precursor of zirconium tetrabutoxide and titanium tetrabutoxide, and annealed at 300°C for 1 h in argon. Phase composition was determined by grazing incidence X-ray diffraction. Surface roughness of the metal oxide layers were determined by atomic force microscopy. Surface morphology and thickness of the obtained layers were studied by scanning electron microscopy. It was found that all obtained layers revealed a composite structure, and were characterized by low surface roughness and thickness parameters. A homogeneous structure of the metal oxide layers deposited onto the surface of the medical NiTi alloy was ascertained only for double- and triple-layers.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 1069-1071
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kerr Effect Investigations of Magnetic Interlayer Interactions in EuS-PbS Multilayers
    Autorzy:
    Kowalczyk, L.
    Chernyshova, M.
    Story, T.
    Ha, J. K.
    Voloubev, V. V.
    Sipatov, A. Yu.
    Powiązania:
    https://bibliotekanauki.pl/articles/2028788.pdf
    Data publikacji:
    2001-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.Ck
    75.30.Et
    Opis:
    Kerr magnetometry was employed to study the temperature dependence of magnetization and magnetic hysteresis loops in ferromagnetic EuS-PbS semiconductor multilayers in the temperature range T=3-35 K at low magnetic fields H≤150 Oe. For EuS-PbS/KCl(100) structures with ultrathin non-magnetic PbS spacer of 1~nm, we observed a maximum on the temperature dependence of magnetization at low fields H≤30 Oe. For higher fields, we found for these structures a regular mean-field-like increase in magnetization with decreasing temperature. The same regular behavior was also found for EuS-PbS/KCl structures with thicker PbS spacer, as well as for all EuS-PbS/BaF$\text{}_{2}$(111) multilayers independently of spacer thickness. For qualitative interpretation of these findings, we consider two magnetic contributions to the total energy of EuS-PbS multilayers: the Zeeman energy and the antiferromagnetic interlayer exchange coupling between ferromagnetic EuS layers via diamagnetic PbS spacer.
    Źródło:
    Acta Physica Polonica A; 2001, 100, 3; 357-363
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Hot Pressing on the Microstructure of Multi-Layered Ti/Al Composites
    Autorzy:
    Kowalski, Wojciech
    Paul, Henryk
    Petrzak, Paweł
    Maj, Łukasz
    Mania, Izabela
    Faryna, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2049145.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Ti/al multilayers
    electron microscopy
    impact test
    Opis:
    Metal-intermetallic layered (MIL) composites attract considerable attention due to their remarkable structural and ballistic performance. This study aimed to develop a Ti/Al-based multilayered MIL material by adding ceramic powders, since they can improve the composite’s impact resistance. To this end, an experiment was conducted which a stack of alternating Ti and al sheets bonded by hot pressing; Ti/Al multilayers containing additional layers of Al2O3 and SiC powders were also produced. The samples obtained were examined using electron microscopy techniques. The clads’ mechanical properties were investigated using a Charpy hammer. In the reaction zone, only one intermetallic phase occurred: the Al3Ti phase. The model with an additional Al2O3 layer showed the highest impact energy. none of the Ti/Al clads broke during the Charpy impact test, a result proving their high ductility.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 4; 1149-1156
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hall Effect and Magnetoresistance in Magnetic Multilayers with Alternating In-Plane and Out-of-Plane Anisotropies
    Autorzy:
    Błaszyk, M.
    Luciński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813492.pdf
    Data publikacji:
    2008-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.21.Ac
    73.40.-c
    75.47.De
    75.70.-i
    72.15.Gd
    Opis:
    A direct comparison between the Hall effects and giant magnetoresistance of ferromagnetic multilayers of similar composition $(Ni_{80}Fe_{20}//Au//Co//Au)_N$ with alternating in-plane and out-of-plane magnetization direction of Co layers is presented. The characteristic features at magnetic field-dependence of giant magnetoresistance were correlated with the creation and annihilation of the stripe domains in Co layer, with perpendicular anisotropy. The nucleation field values were investigated as an Au layer thickness function. Furthermore, the in situ conductance measurement results characterised the island growth mode of the ferromagnetic layers. The percolation thicknesses were also indicated.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 2; 663-668
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Anisotropy in Co/Nd Multilayers with Depth-Selectively Inserted $\text{}^{57}$Fe Probe Layer
    Autorzy:
    Baczewski, L. T.
    Mibu, K.
    Nagahama, T.
    Shinjo, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013044.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Gw
    75.70.-i
    76.80.+y
    Opis:
    Multilayers of Co/Nd with probe layer of 2 Å of $\text{}^{57}$Fe evaporated in UHV conditions were studied by means of vibrating sample magnetometry and Mössbauer spectroscopy at T = 4.2 K. Isomer shift, hyperfine field distribution and direction was obtained from the Mössbauer data computer fitting. Magnetic anisotropy was studied and discussed. The easy magnetization direction was close to the perpendicular direction for both samples but the tendency to perpendicular anisotropy was stronger when the Fe probe layer was placed in the vicinity of Co/Nd interface.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 439-442
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Studies of Non-Magnetic Spacer in Thin Fe/Si Multilayers
    Autorzy:
    Szuszkiewicz, W.
    Jouanne, M.
    Morhange, J.
    Chernyshova, M.
    Kowalczyk, L.
    Łusakowska, E.
    Wandziuk, P.
    Luciński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044545.pdf
    Data publikacji:
    2005-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.-a
    75.70.-i
    78.30.-j
    Opis:
    Structures containing magnetic metallic layers attract a lot of attention because of their possible applications in the area of spintronics. The hybrid structures compatible with the Si crystal lattice parameter are of special interest. In this work the short-period Fe/Si multilayers were grown by the sputtering onto (001)-oriented Si substrate and investigated by various techniques. After the deposition, all multilayers were characterized by atomic force microscopy. The goal of the present paper was to determine the chemical composition of thin layer created at the interface in Fe/Si multilayers due to the Fe diffusion into Si, as well as to analyze the phenomena, which take place in this area. The results of the optical characterization by the Raman scattering were correlated with the magnetic properties of investigated structures (determined by means of the Kerr rotation).
    Źródło:
    Acta Physica Polonica A; 2005, 108, 5; 891-896
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Layer and Interface Structure of CoFe/Ru Multilayers
    Autorzy:
    Pym, A.
    Lamperti, A.
    Cardoso, S.
    Freitas, P.
    Tanner, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1814028.pdf
    Data publikacji:
    2007-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.10.Kw
    68.65.Ac
    68.35.Ct
    75.50.Kj
    85.75.Dd
    85.70.Ay
    Opis:
    Grazing incidence X-ray scattering measurements have been performed to probe the structure of CoFe/Ru layers and their interfaces. It was found that the interface width increased approximately linearly with the layer number from the substrate in a multilayer and that a substantial asymmetry existed between the width of CoFe/Ru and Ru/CoFe interfaces. By co-minimizing both the specular and diffuse scatter with that simulated from a model structure, the topological roughness amplitude was determined to be comparable to the intermixing interface width.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 6; 1243-1248
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Perturbed Angular Correlation Study of Fe/Cr (1 0 0) and Fe/Co (1 -1 0) Multilayers
    Autorzy:
    Meersschaut, J.
    Swinnen, B.
    Dekoster, J.
    Rots, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1953183.pdf
    Data publikacji:
    1997-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    75.70.Fr
    75.50.Rr
    Opis:
    Recently we completed the very first and detailed perturbed angular correlation investigation on MBE-grown very thin film multilayers. The present paper aims to show that otherwise rather unaccessible but unique information on the (interface) magnetism could be obtained. For the Fe/Cr(1 0 0) multilayer system we observe, below a critical Cr thickness of 5.0 nm, a collapse of the spin-density-wave ordering in chromium. While the magnetization in the Fe-layer is in-plane, the Cr magnetization in thicker layers is out-of-plane. In the Fe/Co (1 -1 0) system, the observation of transferred magnetic hyperfine field satellites and their temperature dependence leads to the determination of an oscillating magnetic moment profile at the Fe/Co interface as well as a structure model for the superlattice.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 1; 217-220
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of EuS/Co Multilayers on KCl and BaF₂ Substrates
    Autorzy:
    Szot, M.
    Kowalczyk, L.
    Story, T.
    Domukhovski, V.
    Knoff, W.
    Gas, K.
    Volobuev, V.
    Sipatov, A.
    Fedorov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811998.pdf
    Data publikacji:
    2008-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Et
    75.75.+a
    Opis:
    Magnetic and structural properties of EuS/Co multilayers were studied by magnetic optical Kerr effect and SQUID magnetometry techniques and by X-ray diffraction method. The multilayers containing monocrystalline, ferromagnetic EuS layer (thickness 35-55 Å) and metallic Co layer (thickness 40-250 Å), were grown on KCl (001) and BaF₂ (111) substrates using high vacuum deposition technique employing electron guns for Co and EuS. All investigated EuS/Co multilayers exhibit ferromagnetic properties at room temperature due to Co layer with the ferromagnetic transition in EuS layer clearly marked upon cooling below 16 K. In EuS/Co/EuS trilayers grown on KCl substrate the antiferromagnetic alignment of magnetization vectors of Co and EuS layers was experimentally observed as a characteristic low field plateau on magnetization hysteresis loops and a decrease in multilayer magnetization below 16 K. In Co/EuS bilayers the characteristic temperature dependent shift of magnetization loops was found due to exchange bias effect attributed to the CoO/Co interface formed by the oxidation of the top Co layer.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 5; 1397-1402
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Behaviour of Surfactants during the Growth of Co/Cu Multilayers
    Autorzy:
    Polit, A.
    Kąc, M.
    Krupiński, M.
    Samul, B.
    Zabila, Y.
    MarszaŁek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1814035.pdf
    Data publikacji:
    2007-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.80.Pv
    61.10.Kw
    68.65.Ac
    68.55.Ln
    Opis:
    The $[Co(1 nm)//Cu(2 nm)]_N$ multilayers with different numbers of bilayer repetitions (N=3 and 10) were thermally evaporated on Si(100) substrates with a small amount of Bi or Pb deposited only on the first and on the second Cu layer. The chemical composition of the surface after each step of the preparation process was studied by Auger electron spectroscopy. The evolution of the Auger peaks showed the segregation of Bi and Pb surfactants. During the evaporation of the subsequent Co and Cu layers, gradual decrease in the surfactant amount on the surface was observed. No appearance of Co peak on the Cu layer, and Cu peak on the Co layer even for a coverage of a few å indicates the layer continuity. The interface roughness of the surfactant-mediated Co/Cu layers analyzed by X-ray reflectometry (when surfactant was deposited twice) was similar to the pure Co/Cu samples. However, more repetitions of surfactant, by reduction of interface roughness, improve the layer quality.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 6; 1281-1287
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    XAFS Studies of the Behaviour of Bi in Co/Cu Multilayers
    Autorzy:
    Krupiński, M.
    Kąc, M.
    Polit, A.
    Zabila, Y.
    Zając, D.
    Marszałek, M.
    Kapusta, Cz.
    Dobrowolska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1809826.pdf
    Data publikacji:
    2009-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cj
    68.55.-a
    68.65.Ac
    Opis:
    The atomic environment of Bi atoms in the Co/Cu multilayered system was studied with X-ray absorption fine structure spectroscopy. Experiments were carried out on a Co(1 nm)/Cu(2 nm) system with 5 and 10 repetitions of Co/Cu evaporated with very low deposition rate in ultrahigh vacuum. A very small amount of Bi (0.06 nm) was deposited on each Cu film in the system. The X-ray absorption fine structure spectra were measured at the $BiL_3$ edge in the X-ray absorption near-edge structure and extended X-ray absorption fine structure ranges at the Beamline X1 of HASYLAB/DESY synchrotron laboratory in Hamburg. The experimental data showed different local neighbourhood of Bi, depending on the number of Co/Cu bilayer repetitions. The results are discussed in terms of the location and segregation of the Bi atoms as well as its possible oxidation ways.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 2; 565-567
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selective Modification of Magnetic Properties of $Co_1$ /Au/$Co_2$/Au Multilayers by He Ion Bombardment
    Autorzy:
    Urbaniak, M.
    Stobiecki, F.
    Engel, D.
    Szymański, B.
    Ehresmann, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810562.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.80.Jh
    75.47.De
    75.70.Cn
    Opis:
    We show that in a $[Co_1//Au//Co_2//Au]_4$ multilayer, where $Co_{1(2)}$ denote Co layers of different thicknesses, a 10 keV He-ion bombardment with a 6×$10^{14}$ ions $cm^{-2}$ dose leads to changes of the easy direction from out-of-plane to in-plane in the thicker Co layers ($t_{Co2}$ = 1 nm) while the perpendicular anisotropy of the thinner Co layers ($t_{Co1}$ = 0.6 nm) is preserved. The investigated multilayers were obtained by sputtering and the thickness of the Au layers ($t_{Au}$ = 4 nm) ensured that a direct coupling between the Co layers (through pinholes) and Ruderman-Kittel-Kasuya-Yosida-like interactions were negligible.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 326-328
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface Plasmon-Polariton Assisted Metal-Dielectric Multilayers as Passband Filters for Ultraviolet Range
    Autorzy:
    Jakšić, Z.
    Maksimović, M.
    Sarajlić, M.
    Tanasković, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047856.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.79.Wc
    42.79.Ci
    42.25.Bs
    42.25.Hz
    42.70.Qs
    Opis:
    We designed and fabricated metal-dielectric multilayers intended for passband filters in the ultraviolet range. We determined the dispersion characteristics by the Bloch approach to evanescent wave resonant coupling and calculated the spectral characteristics using the transfer matrix method while taking into account real dispersion and absorptive losses. We considered the influence of nanoscale interface roughness as a means to couple evanescent electromagnetic field to the propagating far field modes. In our structures both propagating and evanescent modes contribute to the overall performance, resulting in an enhanced transmission in the desired range, while retaining a strong suppression of undesired frequencies of more than four orders of magnitude. In our experiments we used radiofrequent sputtering of silver and silica and characterized our multilayers by UV-vis spectroscopy.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 953-958
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coatings with advanced microstructure for biomedical applications
    Powłoki o złożonej architekturze do zastosowań biomedycznych
    Autorzy:
    Kot, M.
    Major, Ł.
    Major, R.
    Lackner, J.
    Pontié, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/189614.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    carbon coatings
    multilayers
    biotribology
    nanohardness
    friction
    wear
    powłoki węglowe
    powłoki wielowarstwowe
    biotribologia
    nanotwardość
    tarcie
    zużycie
    Opis:
    The paper presents the effect of the complex architecture of Cr/CrN+a-C:H coatings on their mechanical and tribological properties. These advanced coatings were compared with CrN single coatings and Cr/CrN multilayers. All of them were deposited by the magnetron sputtering technique. The conducted tests allowed nanohardness, elasticity modulus, fracture toughness, and adhesion of coatings to steel substrates to be determined. Tribological tests were carried out under dry friction and in the presence of phosphate-buffered saline PBS and foetal bovine serum FBS. For all test conditions, the friction coefficient and the wear index of the produced coatings were determined. The lowest wear and the lowest coefficient of friction are exhibited by coatings with complex Cr/CrN+a-C:H architecture. Furthermore, they are also resistant to the highly corrosive PBS environment.
    W pracy analizowano wpływ złożonej architektury powłok Cr/CrN+a-C:H na ich właściwości mechaniczne i tribologiczne. Porównywano je z powłokami pojedynczymi CrN i wielowarstwowymi Cr/CrN, które wytwarzano techniką magnetronowego rozpylania. Przeprowadzone badania umożliwiły określenie twardości, modułu sprężystości, odporności na pękanie i adhezji do podłoża. Testy tribologiczne przeprowadzono w warunkach tarcia suchego oraz w obecności roztworu soli fizjologicznej PBS i surowicy cielęcej FBS. Dla wszystkich warunków tarcia określono współczynnik tarcia oraz odporność na zużycie wytworzonych powłok. Najmniejszym zużyciem oraz najmniejszymi wartościami współczynnika tarcia charakteryzowały się złożone powłoki Cr/CrN+a-C:H. Przy tym są one także odporne na oddziaływanie korozyjne roztworu PBS.
    Źródło:
    Tribologia; 2017, 272, 2; 77-84
    0208-7774
    Pojawia się w:
    Tribologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    X-ray Reflectivity and Polarized Neutron Reflectivity Investigations of $[Co_{60}Fe_{60}B_{20}//MgO]_n$ Multilayers
    Autorzy:
    Vadalà, M.
    Wolff, M.
    Westerholt, K.
    Zabel, H.
    Wisniowski, P.
    Cardoso, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1814030.pdf
    Data publikacji:
    2007-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.-i
    75.50.Kj
    75.50.Cc
    Opis:
    In recent years magnetic tunnel junctions have been intensively studied and incorporated in magnetic random access memory devices and magnetic sensors, where large tunnelling magnetoresistance ratios are preferred. The largest tunnelling magnetoresistance values until now have been observed in magnetic tunnel junctions with MgO barriers and CoFeB electrodes after annealing of the junction above the recrystallization temperature of the amorphous CoFeB layers. We used X-ray reflectivity and polarized neutron reflectivity to study [Co_{60}Fe_{60}B_ {20}//MgO]_{x14} multilayers with the MgO layers prepared by different methods and annealed at different temperatures in order to compare the interface quality and the structural changes induced upon annealing.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 6; 1249-1257
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of the Temperature, External Magnetic Field, and the Thickness of Pt Sublayer on the Magnetocrystalline Anisotropy Constants in Co/Pt Multilayers
    Autorzy:
    Louail, L.
    Azizi, A.
    Moula, B.
    Maouche, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014551.pdf
    Data publikacji:
    2000-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Gw
    61.14.Hg
    Opis:
    In this paper we present the behaviour of the magnetocrystalline anisotropy constants of [Co$\text{}_{32Å}$Pt$\text{}_{xÅ}$]$\text{}_{6}$ multilayers as a function of temperature, external magnetic field, and non-magnetic layer thickness, observed by means of a torque magnetometer in an in-plane configuration. We have determined the magnetocrystalline anisotropy constants from the magnetic torque curves for different temperatures and in different magnetic fields, taking into account the angle difference between the directions of the external field and the magnetization. Among the results of this paper there are the determination of the critical thickness of Pt and the need to introduce the third order anisotropy constant in the analysis.
    Źródło:
    Acta Physica Polonica A; 2000, 98, 6; 705-713
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interlayer Exchange Coupling in Semiconductor EuS-PbS Ferromagnetic Wedge Multilayers
    Autorzy:
    Kowalczyk, L.
    Wrotek, S.
    Dziawa, P.
    Osinniy, V.
    Szot, M.
    Story, T.
    Sipatov, A. Yu.
    Volobuev, V. V.
    Fedorov, A. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046924.pdf
    Data publikacji:
    2006-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.Ck
    75.30.Et
    Opis:
    Antiferromagnetic interlayer coupling between ferromagnetic layers of EuS via nonmagnetic PbS spacer layer was experimentally studied in EuS-PbS wedge multilayers grown on KCl (001) substrates with EuS thickness of 6 nm and PbS thickness varying in the wedges in the range 0.3-6 nm (i.e. n=1-20 monolayers). Measurements of magnetic hysteresis loops of EuS-PbS multilayers performed in the temperature range 5-30 K by superconducting (SQUID) and magneto-optical magnetometers revealed a rapid increase in saturation magnetic field in multilayers with PbS spacer thinner than about 1.5 nm. It shows a monotonic increase in interlayer coupling strength with a decreasing PbS spacer thickness, in qualitative agreement with 1/2$\text{}^{n}$ dependence predicted theoretically for semiconductor magnetic superlattices.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 2; 225-231
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badanie odporności na pękanie i zużycie przez tarcie powłok wielowarstwowych
    Examination of the fracture toughness and wear resistance of multilayer coatings
    Autorzy:
    Kot, M.
    Rakowski, W.
    Major, Ł.
    Lackner, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/189417.pdf
    Data publikacji:
    2014
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    powłoki wielowarstwowe
    deformacje
    pękanie
    zużycie
    multilayers
    deformations
    fracture
    wear
    Opis:
    W pracy przedstawiono możliwości poprawy odporności na pękanie oraz zużycie powłok azotków metali i węglowych poprzez wprowadzenie międzywarstw z materiału charakteryzującego się sprężysto-plastycznym charakterem deformacji. Przedstawiono wyniki badań indentacyjnych i tribologicznych powłok wielowarstwowych Ti/TiN i a-C:H/TiN, które porównano z właściwościami powłok pojedynczych TiN i a-C:H. Mechanizm deformacji takich powłok określono poprzez testy indentacyjne z wykorzystaniem sferycznych wgłębników i analizę odcisków przy użyciu technik SEM i TEM. Wykazano celowość wprowadzania cienkich warstw tytanu w powłokach wielowarstwowych, których odkształcenia plastyczne przy obciążeniach zewnętrznych prowadzą do poprawy odporności na pękanie oraz kilkukrotnie zmniejszają zużycie w stosunku do powłok pojedynczych.
    The paper presents the opportunity of improving fracture and wear resistance of ceramic and carbon coatings through the introduction of metallic interlayers that exhibit an elastic-plastic character of deformation. The results of indentation and tribological tests of Ti/TiN and a-C:H/TiN multilayer coatings were compared with the results of TiN and a-C:H single coatings. The mechanism of deformation and fracture was analysed by spherical indentation and TEM, SEM microscopic observation of indents. The presented results showed the desirability of the introduction of thin titanium interlayers into multilayer structure. Thin Ti layers were plastically deformed under external contact loading which improved several times the fracture and wear resistance of tested multilayers in comparison to single layers.
    Źródło:
    Tribologia; 2014, 2; 89-99
    0208-7774
    Pojawia się w:
    Tribologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Właściwości powłok wielowarstwowych o różnej grubości warstw Ti/TiN
    Properties of multilayers coatings with different thickness ratios of Ti/TiN
    Autorzy:
    Kot, M.
    Rakowski, W.
    Morgiel, J.
    Major, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/190605.pdf
    Data publikacji:
    2009
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    powłoki wielowarstwowe
    twardość
    test zarysowania
    multilayer coatings
    hardness
    scratch test
    Opis:
    W artykule przedstawiono wyniki badań strukturalnych (TEM) oraz pomiaru mikrotwardości i adhezji do podłoża metodą zarysowania wielowarstwowych powłok Ti/TiN wytworzonych metodą ablacji laserowej (PLD – Pulsed Laser Deposition). Badano powłoki Ti/TiN o okresie multiwarstwy z zakresu 32–500 nm, o równych grubościach podwarstw oraz o różnym stosunku grubości TiN do Ti. Analizowano wpływ liczby granic rozdziału na właściwości mikromechaniczne multiwarstwy. Wyniki badań wskazują na silną zależność twardości od liczby granic rozdziału. Zmniejszanie okresu powłoki wielowarstwowej Ti/TiN z 500 do 62 nm powoduje jej utwardzenie. Natomiast dla okresu 31 nm obserwowano drastyczny spadek twardości i odporności na zarysowanie. Dalsze utwardzenie multiwarstw można uzyskać zwiększając udział fazy ceramicznej w powłoce wielowarstwowej. Twardość powłoki 8xTi/TiN o stosunku grubości 4:1-TiN/Ti jest równa twardości pojedynczej powłoki TiN, natomiast obciążenie krytyczne jest ponad 2-krotnie wyższe.
    Ceramic/metal multilayers with a nanometer thickness of layers are a new type of material for tribological applications. A stack of hard ceramic and tough metallic layers give coatings with higher hardness, adhesion and wear resistance. In the article, micromechanical properties of Ti/TiN multilayers are presented. Multilayers were deposited on 2H7 ferrite steel by the PLD (Pulsed Laser Deposition) technique. The total thickness of multilayers was 1 žm, and the bilayer period varied between 32 nm and 500 nm. Multilayers 8x and 16xTi/TiN with equal thickness of Ti and TiN layers have the best micromechanical properties. For coatings with bilayer thickness 500 to 62 nm, linear rise between hardness and the count of interfaces has been observed. But for 32xTi/TiN, coatings with 16nm thickness of layers, a large deterioration of mechanical properties was measured. The same trend was found for scratch resistance of multilayers. Results give the conclusion that the Ti layer should not be thinner than 25 nm. The next rise of mechanical properties of multilayers could be obtained by changing of TiN to the Ti thickness ratio. 8xTi/TiN multilayers with ratios 1:2 and 1:4 were tested. Hardness of 8xTi/TiN with a 1:4 ratio (27GPa) is equal to the hardness of the ceramic layer TiN; although, there was the introduction of soft metal layers. Scratch resistance of this coating is two times higher than other coatings.
    Źródło:
    Tribologia; 2009, 3; 59-68
    0208-7774
    Pojawia się w:
    Tribologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes of Structure and Magnetic Properties of $(Ni_{80}Fe_{20}//Au//Co//Au)_N$ Multilayers as a Function of Repetition Number N
    Autorzy:
    Szymański, B.
    Stobiecki, F.
    Urbaniak, M.
    Siffalovic, P.
    Majkova, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813609.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.De
    75.70.Cn
    Opis:
    The influence of repetition number N on magnetoresistance, magnetic reversal and structure of sputtered $(Ni_{80}Fe_{20}//Au//Co//Au)_N$ multilayers was investigated. The multilayers are characterized by in-plane $(Ni_{80}Fe_{20})$ and out-of-plane (Co) magnetic anisotropy of ferromagnetic layers and show considerable magnetoresistance effect (ΔR/R) of the giant magnetoresistance type. Increased N results in an enhancement of ΔR/R from about 0.5% for N=1 up to above 5% for N=15. This enhancement is caused by: diminishing the role of electron scattering at the surfaces, decreasing the effect of structural imperfection and the lack of the perpendicular anisotropy of Co layer in the first period. The interpretation is corroborated by low ΔR/R value observed for N=1 and an evolution of the ΔR(H)/R dependence with increasing N. The anisotropy field of Co layers also increases with N.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 205-208
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the temperature stability of a Cu/Ni multilayer
    Ocena trwałości temperaturowej wielowarstwy Cu/Ni
    Autorzy:
    Kucharska, B.
    Kulej, E.
    Gwoździk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/354250.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wielowarstwa Cu/Ni
    trwałość
    stabilność temperaturowa
    Cu/Ni multilayers
    X-ray diffraction
    texture
    atomic force microscopy (AFM)
    Opis:
    The article presents investigation results for a Cu/Ni multilayer as annealed in the temperature range of 40 ÷300 degree Celsjus The Cu/Ni multilayer with a Cu sublayer thickness of 2 nm and an Ni sublayer thickness of 6 nm was fabricated by the magnetron deposition technique. The X-ray structural analysis, XRD, was employed for examination. The characterization of the multilayer before and after the annealing process was done by the measurement of the texture for the Cu/Ni(111) plane, as well as by topography examination on an atomic force microscope (AFM). The state of the multilayer surface were observed using a scanning electron microscope. The thermal stability tests showed that the multilayer had undergone delamination at temperature of 300 degree Celsjus . Up to this temperature, the multilayer retained clear phase boundaries, as confirmed by the presence of satellite peaks in the diffraction patterns. The annealing operation caused structural changes in the multilayer, such as grain growth and an increase in roughness and texture.
    W artykule zaprezentowano wyniki badan wielowarstwy Cu/Ni wygrzewanej w zakresie temperatur 40÷300 stopni Celsjusza. Wielowarstwę Cu/Ni, o grubości podwarstwy Cu równej 2 nm i grubości podwarstwy Ni wynoszącej 6 nm, wytworzono technika osadzania magnetronowego. Do badań zastosowano rentgenowską analizę strukturalna XRD. Charakterystyki wielowarstwy przed i po procesie wygrzewania dokonano poprzez pomiar tekstury dla płaszczyzny Cu/Ni(111) jak również badania topografii na mikroskopie sił atomowych Veeco. Stan powierzchni wielowarstwy badano przy użyciu elektronowego mikroskopu skaningowego Jeol. Badania stabilności temperaturowej wykazały, że wielowarstwa uległa delaminacji w temperaturze 300 stopni Celsjusza. Do tej temperatury wielowarstwa zachowała wyraźne granice międzyfazowe, co potwierdzone zostało obecnością pików satelickich na obrazach dyfrakcyjnych. Wygrzewanie wywołało zmiany strukturalne w wielowarstwie, tj. rozrost ziaren, zwiększenie chropowatości i tekstury.
    Źródło:
    Archives of Metallurgy and Materials; 2012, 57, 3; 671-677
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Anisotropy in Eus-pbs Multilayers
    Autorzy:
    Story, T.
    Swüste, C. H. W.
    Swagten, H. J. M.
    de Jonge, W. J. M.
    Stachow-Wójcik, A.
    Twardowski, A.
    Arciszewska, M.
    Dobrowolski, W.
    Gałązka, R. R.
    Sipatov, A. Yu.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013042.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    75.70.Ak
    Opis:
    We present the results of ferromagnetic resonance studies of the thickness dependence of magnetic anisotropy in 2 series of EuS-PbS multilayers grown on (111) BaF$\text{}_{2}$ and (100) KCl substrates with the EuS thickness varying in the range d=6-70 Å. The anisotropy constant K was found to follow the dependence K(d)=K$\text{}_{V}$+2K$\text{}_{S}$/d , with the surface term K$\text{}_{S}$ larger for layers grown on BaF$\text{}_{2}$ as compared to KCl. This difference is discussed in terms of different thermal stress-induced distortions of cubic crystal lattice of EuS. We found that the thickness of EuS layer required for the perpendicular (to the layer) magnetization is d ≤ 2-3 Å, i.e., it is below 1 monolayer.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 435-438
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of the Plasma Deposition Parameters on the Properties of Ti/TiC Multilayers for Hard Coatings Applications
    Autorzy:
    Saoula, N.
    Henda, K.
    Kesri, R.
    Shrivastava, S.
    Erasmus, R.
    Comins, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490973.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Cd
    68.35.Ct
    68.55.-a
    68.37.Ps
    Opis:
    Titanium carbide (TiC) hard coatings have been obtained on steel and silicon substrates by rf magnetron sputtering process. Two layer coatings have been deposited in order to improve adhesion on steel. The lower layer was titanium metal and the upper TiC layer was obtained by reactive sputtering of the titanium target in Ar and methane gas mixture. The study confirmed that the TiC layer composition depends on the reactive sputtering gas composition and substrate bias voltage. Film microhardness was measured by microindentation. Measurement results showed that the hardness coating depends on the microstructure of our coatings and the polarization of bias substrate is an important parameter to control the microstructure.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 172-174
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic Transport Properties and Growth Mechanisms of Ni-Fe/Au/Co/Au Multilayers from In Situ Conduction Measurements
    Autorzy:
    Błaszyk, M.
    Kempiński, M.
    Buchta, K.
    Chomiuk, P.
    Luciński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1534187.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.50.-h
    73.61.-r
    75.70.Cn
    72.15.-v
    Opis:
    In the following we present the role of surface scattering at Au/Co and Au/Ni-Fe interfaces in Ni-Fe/Au/Co/Au multilayers deposited in different temperatures. Specularity parameter, which describes the electron scattering, is calculated from fitting in situ collected conductance data with the Fuchs-Namba-Tesanovic model. Application of the parallel resistors model enabled to depict changes between Au/Co and Au/Ni-Fe interfaces within multilayers for each repetition. The correlation between enhanced grain boundary scattering for higher deposition temperatures and surface roughness of Ni-Fe/Au/Co/Au multilayers is found.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 861-863
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the Deposition Temperature οn Magnetotransport Properties οf Ni-Fe/Au/Co/Au Multilayers
    Autorzy:
    Błaszyk, M.
    Chomiuk, P.
    Buchta, K.
    Luciński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810589.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.21.Ac
    73.40.-c
    75.47.De
    75.70.-i
    72.15.Gd
    Opis:
    A correlation between the growth process and electrical properties of $[Ni_{80}Fe_{20}(2 nm)//Au(2 nm)//Co(0.8 nm)//Au(2 nm)]_{15}$ multilayers is presented. A set of multilayers of identical composition was deposited in different temperatures. The changes in giant magnetoresistance amplitude were correlated with the changes in Co layers growth process that occur in different temperatures. The in situ conductance measurement leads to the growth mechanism identification in high temperatures as formation of Co islands. Intensified islandisation of Co was eventually confirmed by the temperature changes in shape of the Hall voltage loops, and the evolution of Co layers contribution.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 363-365
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hard and Soft X-Ray Reflectivity Studies οf $(NiFe//Au//Co//Au)_{10}$ Magnetic Multilayers
    Autorzy:
    Szymański, B.
    Stobiecki, F.
    Weis, T.
    Engel, D.
    Urbaniak, M.
    Kuświk, P.
    Lengemann, D.
    Ehresmann, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810593.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cm
    75.60.-d
    75.70.-i
    Opis:
    We report on hard and soft X-ray reflectivity investigations of $(Ni_{80}Fe_{20} (2.2 nm)//Au(2.3 nm)//Co(0.8 nm)//Au(2.3 nm))_{10}$ multilayers. Specular reflectivity curves were measured with Cu $K_{α}$ radiation and circularly polarized synchrotron radiation tuned to Co $L_{3}$ and Ni $L_{3}$ absorption edges. Structural properties of the multilayers were determined from the hard X-ray reflectivity curve. Comparison of reflectivity curves taken at different photon energies shows: (i) small difference in peak positions in dependence of reflectivity versus scattering vector q, (ii) different shapes of satellite Bragg peaks, (iii) different ranges of q for appearance of the Kiessig fringes. Analysis of soft X-ray reflectivity curves taken as a function of magnetic field allows to determine magnetic properties of Co and NiFe layer specifically.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 366-368
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Domains Stimulated Magnetostatic Coupling in NiFe/Au/Co/Au Multilayers Investigated by Complementary Methods
    Autorzy:
    Stobiecki, F.
    Urbaniak, M.
    Szymański, B.
    Kuświk, P.
    Schmidt, M.
    Aleksiejew, J.
    Weis, T.
    Engel, D.
    Lengemann, D.
    Ehresmann, A.
    Kopcewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810577.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.-i
    75.30.Gw
    75.60.-d
    Opis:
    The magnetic structure of $Ni_{80}Fe_{20}$/Au/Co/Au multilayers characterized by easy-plane and easy-axis perpendicular to the sample plane anisotropies for NiFe and Co, respectively, is strongly modified by magnetostatic coupling resulting from stray fields of stripe domains in the Co layers. Using complementary methods it will be shown that the magnetostatic coupling increases with decreasing Au spacer thickness, with the weakening of the easy plane anisotropy of the NiFe layers and with increasing thickness of the Co layers.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 345-347
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of $He^+$ Ion Bombardment on Magnetic Properties of NiFe/Au/Co/Au Multilayers
    Autorzy:
    Kuświk, P.
    Szymański, B.
    Urbaniak, M.
    Stobiecki, F.
    Sveklo, I.
    Kisielewski, J.
    Maziewski, A.
    Jagielski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810579.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.-i
    75.47.De
    75.30.Gw
    75.70.Kw
    Opis:
    The influence of $He^+$ ion bombardment on magnetoresistance, magnetization reversal and domain structure of sputtered $(Ni_{80}Fe_{20}(2 nm)//Au(2 nm)//Co(0.6 nm)//Au(2 nm))_{10}$ multilayers was investigated. The samples were bombarded using $He^+$(30 keV) ions with fluences D varied from $10^{13}$ to 3×$10^{16}$ $He^+$/$cm^{2}$. With increasing D the following changes in magnetic properties were observed: (i) exponential decay of the saturation field of Co layers, (ii) progressive decrease in magnetoresistance as a result of degradation of Co layers perpendicular anisotropy, (iii) linear decrease in stripe domain period with log(D).
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 352-354
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Search for Dimensional Effects in Spin-Glass Transition in Thin Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te Multilayers
    Autorzy:
    Sawicki, M.
    Dietl, T.
    Skośkiewicz, T.
    Karczewski, G.
    Wojtowicz, T.
    Kossut, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1943818.pdf
    Data publikacji:
    1995-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Rr
    75.50.Lk
    75.30.Kz
    75.50.-y
    Opis:
    SQUID magnetic measurements of CdTe/Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te, x ≃ 0.5, multi-layers with different CdMnTe layer thickness w reveal the persistence of the spin-glass irreversibilities down to ≃ 16 Å thin layers, i.e., well beyond the previously postulated 40 Å as a quasi-2D threshold. The freezing temperature T$\text{}_{f}$ is found to be a monotonic function of w, and it obeys a scaling law T$\text{}_{f}$ ∝ w$\text{}^{a}$, with a 0.8 similar to that for canonical spin-glasses. Magnetic properties of all studied structures are found to be independent of the orientation of the magnetic field.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 5; 1038-1042
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Temperature Dependence of Antiferromagnetic Interlayer Exchange Coupling in EuS-PbS Multilayers
    Autorzy:
    Chernyshova, M.
    Kowalczyk, L.
    Baran, M.
    Szczerbakow, A.
    Story, T.
    Smits, C. J. P.
    Filip, A. T.
    Swagten, H. J. M.
    de Jonge, W. J. M.
    Sipatov, A. Yu.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038129.pdf
    Data publikacji:
    2004-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.Ck
    75.30.Et
    Opis:
    Antiferromagnetic interlayer exchange coupling in semiconductor EuS-PbS-EuS ferromagnetic trilayers grown on PbS (001) substrates with ultrathin (0.6-1.2 nm) nonmagnetic PbS spacers is studied by SQUID magnetometry and model calculations. Analysis of the experimentally observed magnetic field and temperature dependence of the magnetization of EuS-PbS structures reveals a rapid decrease in the interlayer coupling energy with increasing temperature indicating a temperature dependence of the microscopic coupling mechanism acting in these all-semiconductor ferromagnetic/nonmagnetic multilayers.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 6; 599-605
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Tailoring of Domains in NiFe/Au/Co/Au Multilayers by He Ion Bombardment through Nanospheres
    Autorzy:
    Glapka, W.
    Kuświk, P.
    Sveklo, I.
    Urbaniak, M.
    Jóźwiak, K.
    Weis, T.
    Engel, D.
    Ehresmann, A.
    Błaszyk, M.
    Szymański, B.
    Maziewski, A.
    Stobiecki, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810578.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.-i
    75.60.-d
    Opis:
    Sputter deposited $(Ni_{80}Fe_{20}//Au//Co//Au)_{10}$ multilayers, characterized by alternating in-plane and perpendicular anisotropies of the NiFe and Co layers, respectively, and out-of-plane stripe (labyrinth) domain structure in the Co layers, were bombarded by $He^+$-ions (10 keV) through a mask consisting of polystyrene nanospheres with a diameter of 470 nm. The changes of multilayers magnetic properties after ion bombardment are correlated with the used mask structure.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 348-351
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure of TiN/Hydroxyapatite Multilayers Deposited on Surface of NiTi Shape Memory Alloy
    Struktura warstw TiN/hydroksyapatyt wytworzonych na powierzchni stopów NiTi wykazujących efekt pamięci kształtu
    Autorzy:
    Dudek, K.
    Goryczka, T.
    Wierzchoń, T.
    Lelątko, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/353974.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    NiTi
    surface modification
    glow discharge technique
    TiN
    hydroxyapatite
    modyfikacja powierzchni
    metoda jarzeniowa
    hydroksyapatyt
    Opis:
    In order to improve a corrosion resistance and biocompatibility of NiTi shape memory alloys, the surface of the NiTi alloy was covered by protective layers. The paper presents results of the layers composed of titanium nitride and hydroxyapatite (HAp). The TiN layers were deposited using the glow discharge technique and then the bioactive hydroxyapatite layer was formed from simulated body fluids solution. The results of the structure studies and microscopic observations confirmed that on the surface of the NiTi alloy a thin titanium nitride layer 35-50 nm thick (depending on the glow discharge technique parameters) was obtained. The structure of the deposited layers was studied by means of the X-ray diffraction technique. Also, mechanical parameters of obtained layers were characterized using nanoindentation. On the top of the titanium nitride, a layer consisted of hydroxyapatite and NaCl was formed. Applied parameters of deposition process did not lead to decomposition of the NiTi parent phase (B2) to the equilibrium ones.
    W celu poprawy właściwości korozyjnych, biokompatybilności oraz biofunkcjonalności stopów NiTi wykazujących efekt pamięci kształtu, stosuje się różne metody modyfikacji ich powierzchni. W prezentowanej pracy przedstawiono wyniki badań warstw powierzchniowych złożonych z azotków tytanu oraz hydroksyapatytu. Warstwy TiN zostały wytworzone przy użyciu metody jarzeniowej, a następnie na ich powierzchni został osadzony hydroksyapatyt z roztworu SBF. Wyniki przeprowadzonych badań strukturalnych oraz obserwacji mikroskopowych potwierdziły, że na powierzchni stopu NiTi wytworzyła się cienka warstwa azotku tytanu o grubości 35-50 nm (w zależności od zastosowanych parametrów procesu jarzeniowego). Z kolei na powierzchni warstwy azotowanej powstała warstwa składająca się z hydroksyapatytu oraz NaCl. Zastosowane parametry wytwarzania warstw nie doprowadziły do rozkładu fazy macierzystej stopu NiTi (B2) na fazy równowagowe. Fakt ten jest niezwykle istotny z uwagi na wystąpienie odwracalnej przemiany martenzytycznej oraz zjawiska pamięci kształtu.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 3A; 1777-1781
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic and Structural Properties of EuS-PbS Multilayers Grown on n-PbS (100) Substrates
    Autorzy:
    Chernyshova, M.
    Łusakowska, E.
    Domukhovski, V.
    Grasza, K.
    Szczerbakow, A.
    Wrotek, S.
    Kowalczyk, L.
    Story, T.
    Smits, C. J. P.
    Swagten, H. J. M.
    De Jonge, W. J. M.
    Palosz, W.
    Sipatov, A. Yu.
    Volobuev, V. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035589.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.Ck
    75.30.Et
    Opis:
    Magnetic properties of semiconductor EuS(t)-PbS(d)-EuS(t) ferromagnetic trilayers (t=30÷300Å and d=7.5÷70Å) grown on n-type monocrystalline PbS (100) substrate were studied by SQUID magnetometry and ferromagnetic resonance technique yielding, in particular, the dependence of the ferromagnetic Curie temperature on the thickness of the EuS layer. Structural parameters of layers were examined by X-ray powder diffraction analysis. A high structural quality of the substrate and the multilayer was verified by the measurements of the X-ray rocking curve width indicating the values of the order of 100 arcsec and by atomic force microscopy revealing the presence on the cleft PbS surface regions practically flat in the atomic scale over the area of 1×0.1μm$\text{}^{2}$.
    Źródło:
    Acta Physica Polonica A; 2002, 102, 4-5; 609-615
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural and magnetic properties of MBE grown (Fe/Pt) (111) multilayers
    Autorzy:
    Marynowska, A.
    Dynowska, E.
    Lewińska, S.
    Seki, T.
    Takanashi, K.
    Kanak, J.
    Pietruczik, A.
    Aleszkiewicz, P.
    Wawro, A.
    Ślawska-Waniewska, A.
    Baczewski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1058152.pdf
    Data publikacji:
    2016-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    61.05.jh
    68.35.bd
    68.35.Ct
    68.37.Ef
    68.37.Ps
    68.65.Ac
    75.50.Bb
    75.70.Ak
    Opis:
    Series of Al₂O₃(0001)/Pt/(Fe/Pt)ₙ/Pt multilayers with variable number of bilayers n and thicknesses of individual layers were grown using molecular beam epitaxy to investigate influence of buffer layer structure, number of bilayers, and individual layer thickness on their structural and magnetic properties. Both columnar and monocrystalline 10 nm Pt (111) buffer layers were used in the experiment. Structure of Pt buffer layer determined the roughness of Fe/Pt interfaces and consequently magnetic properties of the multilayers. When multilayers were deposited on columnar Pt buffer layer, we observed increase of Fe/Pt interfaces roughness with increasing number of bilayers to values exceeding the nominal Fe/Pt bilayer thickness in the upper part of the sample volume, which resulted in the increment of coercivity in the sample with n=15 determined from hysteresis loops measured for perpendicular orientation of magnetic field. When Fe/Pt multilayers were deposited on monocrystalline Pt buffer layer, Fe/Pt interfaces were smooth regardless the number of bilayers. All samples, despite of the quality of buffer layer, number of bilayers, and individual layer thickness revealed easy magnetisation axis oriented in the sample plane.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 6; 1363-1370
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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