Temat: 75.70.Cn - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Novel Mechanism of Biquadratic Coupling in Magnetic Superlattices
Autorzy:: Gruhn, W.
Powiązania:: https://bibliotekanauki.pl/articles/1955468.pdf
Data publikacji:: 1997-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.70.Cn
Opis:: Using the modified total energy approach of Bruno, we prove that for the transition metal or rare-earth superlattices the additional scattering of free electrons on magnetic ion multipole moment gives rise to ferroquadrupolar biquadratic coupling between magnetic layers. We show that in this novel, intrinsic mechanism, the anisotropy of the magnetoresistivity should manifest itself.
Źródło:: Acta Physica Polonica A; 1997, 91, 2; 303-306
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

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

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Skocz do pozycji: 3.

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

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Skocz do pozycji: 4.

Tytuł:: RKKY-like Biquadratic Exchange in Magnetic Superlattices
Autorzy:: Gruhn, W.
Bąk, Z.
Jaroszewicz, R.
Powiązania:: https://bibliotekanauki.pl/articles/1945268.pdf
Data publikacji:: 1996-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.70.Cn
75.70.Fr
Opis:: We show that in magnetic metallic superlattices along with the bilinear RKKY-reminiscent interaction between magnetic superlattices there can be an important quadrupole-quadrupole coupling. In an analytical way we derive the range functions of the quadrupol-quadrupole interaction and discuss its relation to magnetoresistivity.
Źródło:: Acta Physica Polonica A; 1996, 89, 3; 417-420
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Lattice Misfit Strain as Origin for Biquadratic Interlayer Coupling
Autorzy:: Jaroszewicz, R.
Bąk, Z.
Gruhn, W.
Powiązania:: https://bibliotekanauki.pl/articles/1945269.pdf
Data publikacji:: 1996-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.70.Cn
75.70.Fr
Opis:: The direct observations of some MBE grown superlattices show large interfacial undulations, which is attributed to the elastic relaxation of tensile layers. Assuming that the interface lateral lattice deformation, due to ionic radii misfit, is given by the periodic solution of the Frenkel-Kontorova model, we calculate the magnetoelastic contribution to the biquadratic magnetic coupling between ferromagnetic layers across the nonmagnetic spacer. We show that due to the correlated modulations of the effective bilinear exchange integral, there arises a biquadratic exchange which favours perpendicular orientations of magnetization in adjacent ferromagnetic layers.
Źródło:: Acta Physica Polonica A; 1996, 89, 3; 421-424
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Magnetoelastic Effects and Magnetic anisotropy in Superlattice System
Autorzy:: Jaroszewicz, R.
Bąk, Z.
Powiązania:: https://bibliotekanauki.pl/articles/1955483.pdf
Data publikacji:: 1997-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.70.Cn
75.70.Ak
Opis:: In this contribution, we will discuss the effect of interface misfit strain on magnetic coupling of ferromagnetic layers, across intervening, metallic spacer in the epitaxial superlattice system. We calculate the interface lateral lattice deformation, due to ionic radii misfit within the Frenkel-Kontorova model and derive its influence on surface magnetic anisotropy and electronic properties of the nonmagnetic spacer. We will study also the origin of the interface magnetoelastic asymmetry in superlattices and its effect on magnetic coupling between magnetic layers. Also the magnetoelastic contribution to the in-plane exchange coupling is widely discussed.
Źródło:: Acta Physica Polonica A; 1997, 91, 2; 325-328
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: From the Co Nanocrystals to Their Self-Organizations: Towards Ferromagnetism at Room Temperature
Autorzy:: Lisiecki, I.
Powiązania:: https://bibliotekanauki.pl/articles/1490092.pdf
Data publikacji:: 2012-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.50.Tt
75.70.Cn
Opis:: Here, we show that rather uniform 7 nm Co nanocrystals self-organize into long-range two- and three-dimensional superlattices. Due to this ability we have to control the mesoscopic ordering; unexpected intrinsic collective chemical and physical properties have been discovered. By annealing treatment, a crystallographic transition from a polycrystalline fcc- to single crystalline hcp-Co phase is obtained leading to a drastic change in the magnetic properties such as an increase in the blocking temperature that can reach a value close to room temperature. Neither coalescence between nanocrystals nor oxidation of the Co material is observed. In these artificial solids, when the individual nanocrystal anisotropy is low, super-spin glass behavior is observed.
Źródło:: Acta Physica Polonica A; 2012, 121, 2; 426-433
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

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

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Skocz do pozycji: 9.

Tytuł:: Surface Magnetostriction within Néels Model
Autorzy:: Żuberek, R.
Żymierska, D.
Szymczak, H.
Powiązania:: https://bibliotekanauki.pl/articles/1930607.pdf
Data publikacji:: 1994-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.30.Pd
75.70.Cn
Opis:: The aim of the present paper is to determine the surface magnetostriction in the spirit of Néel's model of the surface magnetic anisotropy. Calculations have been performed for bcc and fcc ferromagnetic crystals.
Źródło:: Acta Physica Polonica A; 1994, 85, 2; 439-442
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Interface Effective Pinning and Dynamical Coupling of Spin Waves in Bilayer Ferromagnetic Films with Canted Magnetizations
Autorzy:: Puszkarski, H.
Cottam, M. G.
Powiązania:: https://bibliotekanauki.pl/articles/1887424.pdf
Data publikacji:: 1991-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.30.Ds
75.70.Cn
Opis:: We present a theory for the spin-wave excitations in bilayer magnetic systems with exchange coupling across the interface between two ferromagnetic films having the same crystallographic structure. The Hamiltonian includes exchange and anisotropy terms within each magnetic film of the composite system, as well as at the interface and at the free surfaces. We examine, in particular, the effect of interface canting between the magnetization directions for each film, and we derive effective pinning parameters and dynamic coupling parameters for the interface as functions of the canting angle. We show that, in the special case when the magnetization directions are antiparallel in the bilayer system, the two films may be considered as effectively decoupled as regards the spin-wave dynamics. We discuss the relevance of this theory to recent experimental studies of bilayer ferromagnetic systems that exhibit antiferromagnetic interface exchange.
Źródło:: Acta Physica Polonica A; 1991, 79, 4; 549-564
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Brillouin Zone Mapping of the Existence Conditions for Interface Bilayer Spin-Waves. Effects of the Configuration of the Film Magnetization
Autorzy:: Puszkarski, H.
Józefowicz, R.
Kołodziejczak, B.
Akjouj, A.
Djafari-Rouhani, B.
Dobrzynski, L.
Powiązania:: https://bibliotekanauki.pl/articles/1945427.pdf
Data publikacji:: 1996-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.30.Ds
75.70.Cn
Opis:: For the two interface cubic cuts: sc(110) and sc(111) we consider the existence regions of interface spin-waves of a ferromagnetic bilayer film on the two-dimensional Brillouin zone as to their size and shape versus the respective interface related parameters (interface exchange coupling and intrinsic interface anisotropy) applying the approximation of a very thick bilayer film and the method of Brillouin zone mapping (the three (100) interface cubic orientations have been dealt with earlier [Phys. Rev. B 51, 16008 (1995)]). Of particular interest to us still remains the emergence of interface spin-waves induced by varying dynamic quantities such as the in-plane propagation wave vector k$\text{}_{∥}$. Moreover, in our present investigation, we put especial emphasis on the effect exerted on the Brillouin zone mapping by varying (in the plane perpendicular to the film) the configuration angle of the film magnetization with respect to the film normal. We predict the existence of (at the most two) critical angles $\text{}_{c}$ at which the interface spin-waves emerge. These critical angles are functions of the in-plane wave vector k$\text{}_{∥}$ of interface spin-wave propagation along the interface. Finally, we discuss the effects due to the presence of critical angles with a view to their exploitation in experimental measurements.
Źródło:: Acta Physica Polonica A; 1996, 89, 5-6; 675-688
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Interlayer Exchange Coupling: Effect of Alloying
Autorzy:: Kudrnovský, J.
Drchal, V.
Turek, I.
Šob, M.
Weinberger, P.
Powiązania:: https://bibliotekanauki.pl/articles/1952837.pdf
Data publikacji:: 1997-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.70.Cn
75.30.Et
Opis:: The effect of disorder in magnetic layers, in the spacer, and at interfaces between them on periods, amplitudes, and phases of oscillations of interlayer exchange coupling in magnetic multilayers is studied theoretically on the ab initio level. We employ the spin-polarized surface Green function technique within the tight-binding linear muffin-tin orbital method and the Lloyd formulation of the interlayer exchange coupling. The coherent potential approximation is used to describe the effect of alloying. The calculations are significantly simplified by employing the vertex-cancellation theorem. Numerical results illustrating the effect of various kinds of disorder in the system on the properties of the interlayer exchange coupling are presented.
Źródło:: Acta Physica Polonica A; 1997, 91, 1; 15-25
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

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

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Skocz do pozycji: 14.

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

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Skocz do pozycji: 15.

Tytuł:: Semiconductor Ferromagnetic Structures
Autorzy:: Story, T.
Powiązania:: https://bibliotekanauki.pl/articles/2014124.pdf
Data publikacji:: 2000-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.50.Pp
75.70.Cn
Opis:: Ferromagnetic semiconductor structures such as superlattices or trilayers form a new class of magnetic systems composed entirely of semiconductor materials. The examples are Ga$\text{}_{1-x}$Mn$\text{}_{x}$As-AlGaAs with the ferromagnetic layer of GaMnAs semimagnetic (diluted magnetic) semiconductor or EuS-PbS with the ferromagnetic member (EuS) of the family of europium chalcogenides. We discuss the spectrum of perspective ferromagnetic semiconductor materials, the effect of size and stress on magnetic properties of ultrathin semiconductor ferromagnetic layers, and the effect of interlayer exchange in all-semiconductor systems.
Źródło:: Acta Physica Polonica A; 2000, 98, 3; 171-181
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 16.

Tytuł:: Magnetization Curves of Geometrically Frustrated Exchange-Biased FM/AFM Bilayers
Autorzy:: Pankratova, M.
Žukovič, M.
Powiązania:: https://bibliotekanauki.pl/articles/1032766.pdf
Data publikacji:: 2017-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.60.Ej
75.70.Cn
Opis:: We consider a ferromagnetic/antiferromagnetic bilayer on a triangular lattice in the framework of the classical XY model. The impact of the geometrical frustration in this system on the magnetization curves and the exchange bias phenomenon is studied. The magnetization curves and the phase diagram for such systems are obtained. We observe horizontal plateaus and a split of the hysteresis loop on the magnetization curves. It is shown that the shift of the hysteresis loop (exchange bias) occurs for the systems with a magnetically hard antiferromagnet.
Źródło:: Acta Physica Polonica A; 2017, 131, 4; 642-644
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 17.

Tytuł:: Current-Induced Spin Accumulation and Spin Transfer Torque in a Néel Domain Wall
Autorzy:: Baláž, P.
Szymczyk, Ł.
Dugaev, V.
Barnaś, J.
Powiązania:: https://bibliotekanauki.pl/articles/1427608.pdf
Data publikacji:: 2012-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.60.Ch
75.70.Cn
Opis:: Current-induced spin accumulation in a domain wall and the associated spin torque exerted on the wall are analyzed theoretically. The considerations are limited to a relatively thick Néel domain wall in a bulk ferromagnetic metal. The current-induced spin density is calculated using the linear response theory and the Green function formalism.
Źródło:: Acta Physica Polonica A; 2012, 121, 5-6; 1210-1212
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 18.

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

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Skocz do pozycji: 19.

Tytuł:: Thermally Assisted Current-Driven Dynamics in Asymmetric Spin Valves
Autorzy:: Gmitra, M.
Barnaś, J.
Horváth, D.
Powiązania:: https://bibliotekanauki.pl/articles/1813513.pdf
Data publikacji:: 2008-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.60.Ch
75.70.Cn
Opis:: Current-induced steady precessional modes in standard spin valves are usually excited as an interplay of spin-transfer torque, Gilbert damping, and external magnetic field. We propose an asymmetric spin valve, in which the spin current can excite stationary precessional modes also at zero external magnetic field. We also show that finite temperature can induce transitions between different dynamical modes. These transitions, in turn, lead to telegraph noise in magnetoresistance.
Źródło:: Acta Physica Polonica A; 2008, 113, 1; 31-34
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 20.

Tytuł:: Magnetic and Magnetoelectric Effects within a Sandwich Structure with the Parabolic Quantum Well
Autorzy:: Gruhn, W.
Powiązania:: https://bibliotekanauki.pl/articles/1813600.pdf
Data publikacji:: 2008-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.70.Cn
75.50.Pp
Opis:: We study magnetic effects in a trilayer formed of magnetic layers separated by a spacer with a parabolic potential profile. The focus is on mechanisms of indirect magnetic interactions within the spacer. We show existence of magnetic oscillations and novel type of magnetoelectric effect.
Źródło:: Acta Physica Polonica A; 2008, 113, 1; 175-178
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 21.

Tytuł:: Magnetic Mesoporous Silica Nanocomposite for Biodiesel Production
Autorzy:: Erdem, S.
Öksüzoğlu, R.
Avşar, S.
Erdem, B.
Powiązania:: https://bibliotekanauki.pl/articles/1031299.pdf
Data publikacji:: 2017-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.70.Cn
88.20.fk
Opis:: Ordered mesoporous silicas can be utilized as support because of having large surface area, tunable porosity, uniform pore size distribution, high thermal stability and modifiable properties. However, these materials introduce separation problems in liquid-phase processes. We have prepared Fe₃O₄-SBA-15-SO₃H solid acid catalyst by combining the properties of a magnetic material and the mesoporous character of silica. The sulfonic acid functionalized solid acid catalyst, containing both magnetic nanoparticles and mesoporous silica, is not only separable but also stable under hydrothermal conditions, which are usually employed for biodiesel production. Esterification of oleic acid with methanol for biodiesel production was carried out effectively and 75% conversion of ester was approximately reached within six hours in the presence of Fe₃O₄-SBA-15-SO₃H magnetic solid acid catalyst. In addition, the catalyst could be separated from the reaction system by applying external magnetic field and reused without deactivation.
Źródło:: Acta Physica Polonica A; 2017, 132, 3; 763-766
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 22.

Tytuł:: Magneto-Optical and Optical Investigation of the Surface Region of Ion implanted Garnet Films
Autorzy:: Lali, Kalandadze
Powiązania:: https://bibliotekanauki.pl/articles/1387379.pdf
Data publikacji:: 2015-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.70.Cn
78.20.Ls
Opis:: In the present work we have shown the efficiency of complex investigation of the ion implanted garnet surface region by magneto-optical and optical methods. We have investigated the optical and magneto-optical properties of the ion-implanted (YBiCaSm)₃(FeGeSi)₅O₁₂ garnet films. It has shown that ion implantation influences significantly the magneto-optical properties of the garnet films and practically does not change its optical characteristics. We have also determined the spectral dependences of the component of the tensor of dielectric permittivity for the surface of ion implanted (YBiCaSm)₃(FeGeSi)₅O₁₂ ferrite-garnet films before and after implantation process. These calculations let us evaluate the influence of implantation on an electronic energy structure of the surface layer for the sample.
Źródło:: Acta Physica Polonica A; 2015, 127, 2; 582-584
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 23.

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

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Skocz do pozycji: 24.

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

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Skocz do pozycji: 25.

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

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Skocz do pozycji: 26.

Tytuł:: Influence of Temperature on Magnetic Properties of $Tb_{26}Co_{74}$/Co/$Fe_{20}Ni_{80}$ Films with Exchange Bias
Autorzy:: Balymov, K.
Kulesh, N.
Stepanova, E.
Vas'kovskiy, V.
Svalov, A.
Powiązania:: https://bibliotekanauki.pl/articles/1377823.pdf
Data publikacji:: 2014-12
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.70.-i
75.30.Et
75.70.Cn
Opis:: Influence of temperature on magnetization process was investigated in exchange coupled $Tb_{26}Co_{74}$/Co/$Fe_{20}Ni_{80}$ films. Temperature dependences of exchange bias field and coercivity of the $Fe_{20}Ni_{80}$ layer were obtained for films with various thicknesses of the Co spacer. The results obtained were interpreted in terms of changes of magnetic interface localization.
Źródło:: Acta Physica Polonica A; 2014, 126, 6; 1312-1314
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 27.

Tytuł:: Spin-Dependent Phenomena in Magnetoelectronic Devices
Autorzy:: BarnaŚ, J.
Gmitra, M.
Rudziński, W.
Wawrzyniak, M.
Dugaev, V.
Kunert, H.
Powiązania:: https://bibliotekanauki.pl/articles/1814031.pdf
Data publikacji:: 2007-12
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.60.Ch
75.70.Cn
75.70.Pa
Opis:: Spin effects in electronic transport properties of artificial magnetic structures, like nanopillar spin valves, tunnel junctions, mesoscopic double-barrier junctions (single-electron transistors) are briefly discussed. Two classes of spin effects are distinguished; i.e. magnetoresistance phenomena due to magnetization rotation, and current-induced magnetic switching and magnetic dynamics.
Źródło:: Acta Physica Polonica A; 2007, 112, 6; 1259-1265
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 28.

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

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Skocz do pozycji: 29.

Tytuł:: Low Temperature Magnetic Properties of Ferromagnetic Layered Composites
Autorzy:: Urbaniak-Kucharczyk, A.
Powiązania:: https://bibliotekanauki.pl/articles/1368196.pdf
Data publikacji:: 2014-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.70.-i
75.70.Cn
75.30.Ds
Opis:: A ferromagnetic layered composite ABAB....ABA is studied by means of Green function approach. Our attention is focused on the elementary excitations and low temperature magnetisation behavior. In the presented paper we take also into account the effects of damping due spin-spin interaction. As a result not only the positions and relative intensities of resonance peaks are obtained, but also the resonance line-width is found. On the basis of Green function method the temperature dependence of magnetization of a ferromagnetic layered composite is calculated and the spin wave parameter B in the Bloch's law $T^{3/2}$ is found and presented in dependence of parameters characterizing the system under consideration.
Źródło:: Acta Physica Polonica A; 2014, 126, 1; 208-209
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 30.

Tytuł:: Experiments on Interlayer Exchange Coupling
Autorzy:: Grünberg, P.
Schaefer, M.
Takanashi, K.
Rücker, U.
Nassar, J.
Mertig, I.
Powiązania:: https://bibliotekanauki.pl/articles/1952836.pdf
Data publikacji:: 1997-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.70.Cn
75.30.Et
75.70.-i
Opis:: The results of various experiments on interlayer exchange coupling will be reviewed. After a general discussion of the theoretical understanding we deal first with 90°-type coupling and show that two mechanisms proposed by Slonczewski can explain our measured data. We furthermore study the coupling of Fe films across Cu$\text{}_{x}$Au$\text{}_{1-x}$ alloys. For the composition with x=0.5, the coupling strength strongly increases with annealing. We believe that this is due to an order-disorder structural transformation in the Cu$\text{}_{x}$Au$\text{}_{1-x}$ alloy. Finally, we present results on epitaxially grown bilayers Fe/EuS(100) and trilayers Fe/EuS/Fe(100). In the latter at room temperature we observe a strong decrease in the coupling strength as a function of the interlayer thickness, with a characteristic length of about 0.1 nm. At low temperatures in the bilayer we find an antiferromagnetic coupling between Fe and the adjacent ferromagnetic EuS.
Źródło:: Acta Physica Polonica A; 1997, 91, 1; 7-14
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 31.

Tytuł:: Interaction Between Magnetic Layers in Structures with Narrow-Gap IV-VI Semiconductors
Autorzy:: Dugaev, V. K.
Litvinov, V. I.
Dobrowolski, W.
Story, T.
Powiązania:: https://bibliotekanauki.pl/articles/2013062.pdf
Data publikacji:: 2000-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.70.Cn
75.50.Pp
75.70.Ak
Opis:: The results of calculation of the indirect exchange interaction between magnetic layers are presented for the case of a structure with narrow-gap semiconducting IV-VI quantum well. The main mechanism is a magnetic polarization of the size-quantized electrons and holes inside the well. This type of interaction is suggested for the explanation of recent experiments on EuS/PbS structures.
Źródło:: Acta Physica Polonica A; 2000, 97, 3; 455-458
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 32.

Tytuł:: Current-Driven Magnetoresistance Oscillations in Asymmetric Spin Valves
Autorzy:: Gmitra, M.
BarnaŚ, J.
Powiązania:: https://bibliotekanauki.pl/articles/1814032.pdf
Data publikacji:: 2007-12
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.60.Ch
75.70.Cn
75.70.Pa
Opis:: Within the macroscopic model we have calculated spin-transfer torque in asymmetric spin valves in the diffusive transport limit.Such systems exhibit a non-standard angular dependence of the torque, which leads to current-induced precessional modes at zero external magnetic field. We have found that the frequency of magnetoresistance oscillations exhibits hysteretic behavior when the system is driven between two steady precessional regimes. A finite temperature can suppress the irreversibility and give rise to bistable regime where, both the precessional regimes coexist.
Źródło:: Acta Physica Polonica A; 2007, 112, 6; 1267-1270
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 33.

Tytuł:: Depth-Resolved XMCD Study of Ultrathin Mo/Co/Au Films
Autorzy:: Sakamaki, M.
Abe, H.
Powiązania:: https://bibliotekanauki.pl/articles/1810551.pdf
Data publikacji:: 2009-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.30.Gw
75.70.Cn
78.70.Dm
Opis:: The effect of Mo overlayer on the magnetism of ultrathin Co films grown on Au(111) was studied. The structure and magnetism at the Mo/Co interface were studied by means of depth-resolved X-ray magnetic circular dichroism. The magnetic moment of Co near the Mo/Co interface was reduced in comparison to the inner part of the film for the samples which have in-plane anisotropy. This effect is more prominent in the case of Mo overlayer with higher roughness, and can be attributed to Co-Mo intermixing at the interface.
Źródło:: Acta Physica Polonica A; 2009, 115, 1; 309-311
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 34.

Tytuł:: Transmittance Magneto-Optical Responses of One-Dimensional Magnetophotonic Heterostructures
Autorzy:: Abdi-Ghaleh, R.
Asad, M.
Powiązania:: https://bibliotekanauki.pl/articles/1205124.pdf
Data publikacji:: 2014-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 42.70.Qs
75.70.Cn
85.70.Sq
Opis:: Transmittance magneto-optical responses of one-dimensional magnetophotonic heterostructures are investigated using 4 by 4 transfer matrix method. It is shown that in a simple magnetophotonic heterostructure constituted of two different periodic structures, the enhanced Faraday rotation associated with high transmittance at a desired wavelength can be realized with specifying optimized repetition numbers and adjusting the thicknesses of the substructure layers. However, the unique features of multichanneled enhanced Faraday rotations are obtained for different configurations of a multiple magnetophotonic heterostructure and the most suitable one to simultaneously support the both resonance wavelengths of $1.3 μm$ and $1.55 μm$ are introduced. These wavelengths are currently used in telecommunication systems. Then the obtained results may have potential applications in designing the multi-function single magneto-optical devices such as multiple Faraday rotators and wavelength division multiplexing systems.
Źródło:: Acta Physica Polonica A; 2014, 126, 3; 705-712
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 35.

Tytuł:: Surface Magnetostriction
Autorzy:: Szymczak, H.
Żuberek, R.
Powiązania:: https://bibliotekanauki.pl/articles/1929324.pdf
Data publikacji:: 1993-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.30.Pd
75.50.Rr
75.70.Cn
Opis:: Experimental and theoretical research on magnetostriction of nanoscale magnetic multilayers is reviewed. The importance of interfaces and the occurrence of the surface magnetostriction is emphasized. It is shown that the dependence of magnetostriction on the magnetic layer thickness is due to the magnetostrictive strains localized at the interface.
Źródło:: Acta Physica Polonica A; 1993, 83, 5; 651-659
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 36.

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

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Skocz do pozycji: 37.

Tytuł:: Electrical Control of Magnetic States
Autorzy:: Barnaś, J.
Powiązania:: https://bibliotekanauki.pl/articles/1536525.pdf
Data publikacji:: 2010-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.60.Ch
75.70.Cn
72.25.-b
Opis:: Charge and spin transport in artificial magnetic structures, like nanopillar spin valves, planar tunnel junctions, and mesoscopic double-barrier junctions (single-electron transistors) are briefly surveyed, with particular emphasis on magnetoresistance effects and current-induced magnetic switching and spin dynamics. The methods of spin current generation are also discussed, particularly the method based on spin Hall effect.
Źródło:: Acta Physica Polonica A; 2010, 118, 2; 199-203
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 38.

Tytuł:: Manipulation of Exchange Coupling in Py/Co/Cr Multilayer Thin Films
Autorzy:: Aköz, M.
Parlak, U.
Şahin, Y.
Tavşan, D.
Tarcan, E.
Öztürk, O.
Tokdemir Öztürk, S.
Erkovan, M.
Powiązania:: https://bibliotekanauki.pl/articles/1401229.pdf
Data publikacji:: 2015-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.70.Cn
75.50.Cc
76.50.+g
Opis:: The main issue addressed in present study is exchange coupling modification between ferromagnetic layers through non-magnetic spacer layers using extra ultra-thin ferromagnetic layers (Co). In order to achieve this goal, we prepared Cr(50 Å) / Py(20 Å) / Co(5 Å) / Cr(7, 10, 13 Å) / Co(5 Å) / Py (30 Å) / Cr(50Å) / Si using magnetron sputtering at UHV conditions and characterized by Ferromagnetic Resonance (FMR) technique. As the present study results were compared to our previous study on (Py/Cr), the exchange coupling energy was increased ten times with the cobalt thin layer
Źródło:: Acta Physica Polonica A; 2015, 127, 4; 992-994
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 39.

Tytuł:: Influence of the Interface Quality on Magnetic Properties of Fe₂₀Ni₈₀/Tb-Co Films with Unidirectional Anisotropy
Autorzy:: Kulesh, N.
Balymov, K.
Vas'kovskiy, V.
Powiązania:: https://bibliotekanauki.pl/articles/1386982.pdf
Data publikacji:: 2015-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.70.Cn
75.30.Et
68.49.Uv
Opis:: Influence of annealing on hysteresis properties of the soft magnetic layer in Fe₂₀Ni₈₀/Tb₂₆Co₇₄ and Fe₂₀Ni₈₀/Ti/Tb₂₆Co₇₄ films with unidirectional anisotropy was investigated. Modification of the interface by introduction of the ultrathin Ti spacer was demonstrated to improve stability of coercivity and exchange bias field. According to our assumption, the Ti spacer can act as a barrier preventing a thermally-induced diffusion between the magnetic layers. In order to verify this point grazing incidence X-ray fluorescent analysis was used. Comparison of two sets of data attributed to the samples with and without Ti spacer at different stages of annealing revealed decrease of the angular shift between Co and Ni dependences even after annealing at 70°C for Fe₂₀Ni₈₀/Tb₂₆Co₇₄ and absent of any changes up to 300°C for the Fe₂₀Ni₈₀/Ti/Tb₂₆Co₇₄ film. These results can be interpreted as an evidence of the low-temperature interface modification in form of diffusion-like process in the samples without Ti spacer.
Źródło:: Acta Physica Polonica A; 2015, 127, 2; 525-527
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 40.

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

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Skocz do pozycji: 41.

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

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Skocz do pozycji: 42.

Tytuł:: Fabrication and Electrical Characterization of PbS-EuS Ferromagnetic Semiconductor Microstructures
Autorzy:: Wrotek, S.
Morawski, A.
Tkaczyk, Z.
Mąkosa, A.
Wosiński, T.
Dybko, K.
Łusakowska, E.
Story, T.
Sipatov, A. Yu.
Pécz, B.
Grasza, K.
Szczerbakow, A.
Wróbel, J.
Powiązania:: https://bibliotekanauki.pl/articles/2038135.pdf
Data publikacji:: 2004-06
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.61.Le
75.30.Et
75.70.Cn
Opis:: Current-voltage characteristics and temperature dependence of differential conductance were studied in lithographically patterned (lateral dimensions from 10 x 10 μm$\text{}^{2}$ to 100 x 100 μm$\text{}^{2}$) ferromagnetic EuS-PbS-EuS microstructures. Below the ferromagnetic transition temperature a 4% decrease in the structure conductance was observed for mutual antiferromagnetic orientation of magnetization vectors of ferromagnetic EuS layers.
Źródło:: Acta Physica Polonica A; 2004, 105, 6; 615-620
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 43.

Tytuł:: Magnetotransport and Magnetic Properties of (Ga,Mn)As and its Heterostructures
Autorzy:: Ohno, H.
Powiązania:: https://bibliotekanauki.pl/articles/1968989.pdf
Data publikacji:: 1998-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.61.Ey
75.50.Pp
75.70.Cn
Opis:: Introduction of high density of Mn in GaAs by low temperature molecular beam epitaxy results in a homogeneous diluted magnetic semiconductor (Ga,Mn)As, which exhibits ferromagnetism at low temperatures. Temperature and magnetic field dependence of magnetotransport and magnetization of (Ga,Mn)As films revealed the Curie temperature T$\text{}_{C}$ which can be as high as 110 K and the p-d exchange, which explains T$\text{}_{C}$ in the framework of the RKKY interaction. Multilayer heterostructures such as all-semiconductor ferromagnet/nonmagnet/ferromagnet trilayer structures and resonant tunneling diodes have been fabricated and studied. These heterostructure results show the potential of the present material system for exploring new physics and for developing new functionality toward future electronic and optical devices.
Źródło:: Acta Physica Polonica A; 1998, 94, 2; 155-164
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 44.

Tytuł:: FMR Study of Co/Ti Bilayer Thin Films
Autorzy:: Erkovan, M.
Tokdemir Öztürk, S.
Taşkın Gazioğlu, D.
Topkaya, R.
Öztürk, O.
Powiązania:: https://bibliotekanauki.pl/articles/1312088.pdf
Data publikacji:: 2014-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.70.Cn
75.50.Cc
76.50.+g
Opis:: We focused on the interaction between two ferromagnetic cobalt layers through a non-magnetic titanium layer. The magnetic properties of the structure were characterized by ferromagnetic resonance technique. The data were collected as a function of non-magnetic titanium layer thickness. Co/Ti multilayer (Ti(50 Å)/Co(45 Å)/Ti(2-40 Å)/Co(40 Å)/Ti(100 Å)) films were grown onto naturally oxidized p-type single crystal Si (100) substrate at UHV condition with magnetron sputtering system at room temperature. The thickness of Ti spacer layer ranges from 2 to 40 Å with 2 Å steps. We did not observe usual optic and acoustic modes; instead we had two broad overlapped peaks for the films ranged from 6 Å to 40 Å. One interesting result was the high anisotropic resonance field values for these films. Exchange coupling between ferromagnetic layers causes shift on resonance field values but these shifts in our samples were much larger than expected. This large anisotropic behavior is not clear at the moment. Our theoretical model was not able to determine a value for the exchange coupling parameter. One reason can be the close thickness values for Co sublayers. The other reason can be the Ti non-magnetic layer. If titanium did not grow layer by layer on cobalt, the cobalt ferromagnetic layers may behave as a single layer. As a result one cannot observe exchange interaction between ferromagnetic layers through non-magnetic spacer.
Źródło:: Acta Physica Polonica A; 2014, 125, 2; 673-676
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 45.

Tytuł:: Transport in Magnetic Layered Structures: Giant Magnetoresistance
Autorzy:: Barnaś, J.
Powiązania:: https://bibliotekanauki.pl/articles/1861048.pdf
Data publikacji:: 1994-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.70.Cn
72.15.Gd
75.50.Rr
Opis:: Basic features of electronic transport in magnetic layered structures consisting of alternating ferromagnetic and nonmagnetic metallic films are analysed theoretically. The considerations are restricted to magnetoresistance originating from the rotation of the film magnetizations from antiparallel to parallel alignment. The influence of spin-dependent potentials on the transport properties is analysed for both current-in-plane and current-perpendicular-to-plane geometries. Quasi-classical and quantum methods are used to calculate the appropriate conductivity. For current-perpendicular-to-plane geometry the periodic spin-dependent effective electron potential plays an important role and can generate giant magnetoresistance also when the electron scattering by impurities and interface roughness is independent of the spin direction, contrary to the case of current-in-plane geometry when a spin-dependent scattering probability is a necessary condition for the giant magnetoresistance to occur.
Źródło:: Acta Physica Polonica A; 1994, 85, 1; 165-177
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 46.

Tytuł:: Brillouin Light Scattering Investigations οf Magnetic and Elastic Properties in MBE Grown Trilayer Mo/Co/Au Systems
Autorzy:: Gieniusz, R.
Błachowicz, T.
Maziewski, A.
Petroutchik, A.
Baczewski, L.
Wawro, A.
Hamrle, J.
Serga, O.
Hillebrands, B.
Powiązania:: https://bibliotekanauki.pl/articles/1810471.pdf
Data publikacji:: 2009-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 76.50.+g
75.70.Cn
75.80.+q
Opis:: The magnetic and elastic properties of epitaxially grown Mo/Co/Au trilayer systems were investigated by the Brillouin light scattering and a ferromagnetic resonance. Using both experimental methods the perpendicular uniaxial anisotropy and the effective in-plane twofold anisotropy contributions were determined as the function of the cobalt thicknesses. Acoustic phonons analysis shows that the elastic constants are decreased with increasing cobalt layer thicknesses.
Źródło:: Acta Physica Polonica A; 2009, 115, 1; 213-216
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 47.

Tytuł:: Spin Wave Characteristics of Inhomogeneous Ferromagnetic Layered Composites
Autorzy:: Urbaniak-Kucharczyk, A.
Powiązania:: https://bibliotekanauki.pl/articles/1030250.pdf
Data publikacji:: 2017-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.70.-i
75.70.Cn
75.30.Ds
75.30.Gw
Opis:: A ferromagnetic layered composite ABAB...ABA with nonuniform distribution of anisotropy parameter is studied. 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 spin wave parameter B and resonance line-width on parameters characterizing system under consideration were obtained for the case of uniform anisotropy parameter and for quadratic distribution of this parameter in magnetic layers, respectively.
Źródło:: Acta Physica Polonica A; 2017, 131, 4; 854-856
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 48.

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

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Skocz do pozycji: 49.

Tytuł:: Quantum Size Effects in Ultrathin Layered Magnetic Systems
Autorzy:: Bruno, P.
Powiązania:: https://bibliotekanauki.pl/articles/1953153.pdf
Data publikacji:: 1997-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.70.Cn
75.30.Et
78.20.Ls
75.70.-i
Opis:: The effect of electron confinement in ultrathin layered magnetic systems is discussed. This leads to quantum size effects which can be observed by photoemission in overlayers. In magnetic multilayers, spectacular oscillatory behavior of the interlayer exchange coupling results from the electron confinement. The quantum size effects manifest themselves also in the magneto-optical properties of ultrathin films.
Źródło:: Acta Physica Polonica A; 1997, 91, 1; 37-54
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 50.

Tytuł:: Structural Studies of Co/Cu and Co/Ru Interfaces Using $\text{}^{59}$Co NMR Method
Autorzy:: Wójcik, M.
Jędryka, E.
Nadolski, S.
Kubinski, D.
Parsons, M.
Holloway, H.
Powiązania:: https://bibliotekanauki.pl/articles/2013219.pdf
Data publikacji:: 2000-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 76.60.Lz
75.70.Pa
75.70.Cn
75.20.En
Opis:: The structural and magnetic properties of three magnetron sputtered multilayers at the 2nd maximum of antiferromagnetic coupling were studied using $\text{}^{59}$Co NMR spectroscopy: [Co(20 Å)/Cu(20 Å)]$\text{}_{20}$, [Co(20 Å )/ Ru(18 Å)]$\text{}_{20}$ and a heterostructure, in which non-magnetic spacers alternated between Cu and Ru. Co/Cu interfaces were found to be relatively sharp, extended over 3 monolayers, while the Co/Ru interfaces extend over 6 monolayers due to the good miscibility of Co and Ru. The NMR restoring field in the heterostructure is found to be the average of the restoring fields in both reference samples.
Źródło:: Acta Physica Polonica A; 2000, 97, 3; 551-554
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 51.

Tytuł:: Effect of Co substitution on Ni₂MnGe Heusler alloy: ab initio study
Autorzy:: Pugaczowa-Michalska, M.
Powiązania:: https://bibliotekanauki.pl/articles/1048335.pdf
Data publikacji:: 2018-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.20.Hr
71.23.-k
75.70.Ak
75.70.Cn
Opis:: Ab initio calculations shown that the Co substitution instead of Ni in Ni₂MnGe with the L2₁ crystallographic structure leads to a decrease of the lattice constant and an increase of the total magnetic moment of the Ni_{2-x}Co_{x}MnGe compounds. The Mn(B) has the largest local moment above 3 μ_{B} coupled parallel to moments on the Ni(A,C) and Co(A,C), which are found in the ranges of 0.19÷0.26 μ_{B} for Ni(A,C) and 1.03÷0.97 μ_{B} for Co(A,C) for studied range of x. Using the results stemming from the total energy calculations, the values of bulk modulus and its pressure derivatives are estimated according to the Murnaghan EOS.
Źródło:: Acta Physica Polonica A; 2018, 133, 3; 495-497
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 52.

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

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Skocz do pozycji: 53.

Tytuł:: Magnetism and Superconductivity in Nd$\text{}_{0.81}$Sr$\text{}_{0.19}$MnO$\text{}_{3}$/YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7}$ Superlattices
Autorzy:: Komissarov, I.
Przysłupski, P.
Dłużewski, P.
Sawicki, M.
Powiązania:: https://bibliotekanauki.pl/articles/2037112.pdf
Data publikacji:: 2004
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.25.Ha
74.78.Fk
75.70.Cn
Opis:: We report on the growth, structural and magnetic characterization of Nd$\text{}_{0.81}$Sr$\text{}_{0.19}$MnO$\text{}_{3}$/YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7}$ (NSMO/YBCO) superlattices. The NSMO system for the doping level of x=0.19 is a ferromagnetic insulator. Multilayers with a fixed NSMO thickness of 13 unit cells and a varying YBCO layer thickness from 2 unit cells to 6 unit cells were sputtered on LaAlO$\text{}_{3}$ substrates. An onset of superconducting transition is seen starting from the multilayer with 3 unit cells of YBCO layer thickness. Hysteresis loops recorded above and below the superconducting transition show a signature of interlayer exchange coupling.
Źródło:: Acta Physica Polonica A; 2004, 105, 1-2; 127-132
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 54.

Tytuł:: Transfer Matrix Approach to One-Dimensional Electron Transport in Graphene Sheets with Piecewise Constant Potentials
Autorzy:: Ghazanfari, S.
Powiązania:: https://bibliotekanauki.pl/articles/1400412.pdf
Data publikacji:: 2013-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 81.05.ue
72.80.vp
75.70.cn
Opis:: We studied one-dimensional electron transport in a system composed of two monolayer graphene sheets with an optional arrangement of different constant rectangular electrostatic potential barriers between them. We derived a generalized transfer matrix for the electron which passes through this system. Finally, we examined our model by applying it on a well known rectangular shape constant potential barrier and we obtained the same result from our method similar to the others.
Źródło:: Acta Physica Polonica A; 2013, 123, 1; 148-151
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 55.

Tytuł:: Superconductivity and Magnetism in Nd$\text{}_{0.5}$Sr$\text{}_{0.5}$MnO$\text{}_{3}$/YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7}$ Superlattices
Autorzy:: Tsarou, A.
Paszkowicz, W.
Minikayev, R.
Dłużewski, P.
Sawicki, M.
Przysłupski, P.
Powiązania:: https://bibliotekanauki.pl/articles/2047250.pdf
Data publikacji:: 2007-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.25.Ha
74.78.Fk
75.70.Cn
Opis:: We report the synthesis and characterization of Nd$\text{}_{0.5}$Sr$\text{}_{0.5}$MnO$\text{}_{3}$/YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7}$ superlattices. X-ray diffraction studies show that the superlattices are [001] oriented. We observe that the magnetic ground state of Nd$\text{}_{0.5}$Sr$\text{}_{0.5}$MnO$\text{}_{3}$ system in a multilayered structure is strongly dependent on the substrate.
Źródło:: Acta Physica Polonica A; 2007, 111, 1; 179-183
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 56.

Tytuł:: Thin Films and Heterostructures of Layered Oxides: Preparation and Properties
Autorzy:: Przysłupski, P.
Powiązania:: https://bibliotekanauki.pl/articles/1964241.pdf
Data publikacji:: 1997-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.70.Cn
74.72.Bk
74.76.-w
Opis:: A brief overview of the deposition and properties of YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7}$ (YBCO) based heterostructures is presented. Emphasis is placed on the assessment of the deposition process and the properties of practical thin films and heterostructures of layered oxides. Besides a reference to the literature we present our recent results concerning deposition, structural and magnetic properties of YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7}$ /RE$\text{}_{1-x}$A$\text{}_{x}$MnO$\text{}_{3}$ (YBCO/REMO) heterostructures.
Źródło:: Acta Physica Polonica A; 1997, 92, 1; 127-133
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 57.

Tytuł:: The Impact of d- and p-Electron Elements on Magnetic Properties of $RT_{x}X₂$ Compounds
Autorzy:: Gil, A.
Powiązania:: https://bibliotekanauki.pl/articles/1397026.pdf
Data publikacji:: 2018-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.20.Eh
75.47.Np
75.50.Ee
75.70.Cn
Opis:: Studies of rare earth compounds with transition metals are one of the dominant trends in modern magnetism and cover a wide range of research both basic and applicative nature. The main aim of the study of lanthanide compounds is to find answers to questions concerning mechanisms of interaction between the magnetic moments. A systematic study of the magnetic properties of rare-earth compounds gives hope for full understanding of magnetism in these families of compounds. For many years the $RT_{x}X₂$ compounds with the crystal structure of CeNiSi₂ - type are in the circle of my interests. Based on my own research and the results published in the literature by other authors, the impact of d- and p-electron elements on magnetic properties of the $RT_{x}X₂$ compounds, where x ≤1 and R = Tb, Dy, Ho, Er; T = Ni, Co, Cu, Fe, Mn, Cr; X = Si, Ge, Sn will be analysed.
Źródło:: Acta Physica Polonica A; 2018, 133, 3; 473-476
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 58.

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

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Skocz do pozycji: 59.

Tytuł:: Asymmetric Magnetization Reversal in the Exchange-Biased MnO/(Ga,Mn)As Heterostructure Studied by Ferromagnetic Resonance
Autorzy:: Dziatkowski, K.
Ge, Z.
Liu, X.
Furdyna, J. K.
Twardowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/2046987.pdf
Data publikacji:: 2006-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.50.Pp
76.50.+g
75.30.Gw
75.70.Cn
Opis:: We report ferromagnetic resonance study of the magnetization reversal in the exchange-coupled MnO/(Ga,Mn)As system. The low-field parts of ferromagnetic resonance spectra measured along [1/10] and [100] directions of (Ga,Mn)As were combined into hysteresis loops, which under field-cooling conditions similarly to SQUID loops are shifted toward negative magnetic fields. The magnetization reversal process revealed by the loops occurred remarkably asymmetric for both sample configurations.
Źródło:: Acta Physica Polonica A; 2006, 110, 3; 319-324
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 60.

Tytuł:: Study of Defect Modes in Photonic Band Structure of Magnetic Photonic Crystals by Means of Greens Function
Autorzy:: Ansari, N.
Tehranchi, M.
Powiązania:: https://bibliotekanauki.pl/articles/1810554.pdf
Data publikacji:: 2009-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.70.Cn
42.70.Qs
84.30.Vn
85.70.Sq
Opis:: In this paper, we create an analytical model to investigate the localized defect modes associated with a defect cell inserted into a one-dimensional magnetic photonic crystal. The structure is a magnetic superlattice with alternative layers of two different magnetic permeability containing a defect cell which is a layer of different nature (material or/and size) from the other layers. This leads to appearance of several localized defect modes within the magnetic photonic band gap. Our analytical approach is based on the transfer matrix and Green's function methods to calculate the frequency and number of the defect modes which can be controlled easily by varying parameter values of the constituent layers of the magnetic photonic crystal. This method results in an analytical formula for prediction of frequency of the defect modes for both TE and TM polarizations at arbitrary angle of incidence.
Źródło:: Acta Physica Polonica A; 2009, 115, 1; 312-314
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 61.

Tytuł:: Investigation of Photonic Band Gaps of One-Dimensional Heterostructure Magnetic Photonic Crystals
Autorzy:: Ansari, N.
Tehranchi, M.
Powiązania:: https://bibliotekanauki.pl/articles/1810598.pdf
Data publikacji:: 2009-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.70.Cn
42.70.Qs
84.30.Vn
85.70.Sq
Opis:: Multiple structures in one-dimensional photonic crystals have great potentials for ultrawide omnireflectors and tunable switches. In this paper, we study the propagation of electromagnetic waves in a one-dimensional heterostructure magnetic photonic crystal for both TE and TM incidence polarizations by means of the transfer matrix method. Results show that by stacking two magnetic photonic crystals as a heterostructure magnetic photonic crystal the omnidirectional total reflection frequency range for any polarization enlarged due to overlapping of photonic band gaps of both magnetic photonic crystals. Omnidirectional band gaps in the heterostructure magnetic photonic crystal is enhanced rather than that in a single magnetic photonic crystal.
Źródło:: Acta Physica Polonica A; 2009, 115, 1; 378-380
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 62.

Tytuł:: Influence of Additions and Stratification on the Magnetic Properties and Out-of-Plane Texture of Nd-Fe-B Films
Autorzy:: Grigoras, M.
Lupu, N.
Chiriac, H.
Borza, F.
Urse, M.
Powiązania:: https://bibliotekanauki.pl/articles/1368477.pdf
Data publikacji:: 2014-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.30.Gw
75.50.Cc
75.50.Vv
75.70.Ak
75.70.Cn
Opis:: Nd-Fe-B films with Ta and Mo additions used as buffer and capping layers and as interlayers have been deposited by r.f. sputtering on heated Si(111) substrates at 370°C and 470°C, and subsequently annealed at temperatures between 550°C and 650°C. In comparison with the Ta/NdFeB/Ta film, the Mo/NdFeB/Mo film deposited at 470°C presents an obvious anisotropic character. Very good anisotropic magnetic properties were obtained for Mo/[NdFeB(180)/Mo(5)]×3/Mo multilayer film deposited at 470°C and then annealed at 550°C. This sample exhibits an increase in coercivity from 1225 kA/m up to 1651.8 kA/m, increase in $M_{r}$/$M_{s}$ ratio from 0.90 up to 0.99, and increase in the maximum energy product from 60.4 to 121.6 kJ/$m^{3}$ as compared to the as-deposited Mo/NdFeB/Mo film. The results demonstrate that after annealing at 550°C the Mo film is more effective for nucleation of $Nd_{2}Fe_{14}B$ hard magnetic grains with c-axis perpendicular to the film plane, especially in multilayer variant.
Źródło:: Acta Physica Polonica A; 2014, 126, 1; 220-221
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 63.

Tytuł:: Exchange Coupled NiFe/NiMn Bilayer Studied by a Vector Network Analyzer Ferromagnetic Resonance
Autorzy:: Głowiński, H.
Załęski, K.
Sprada, J.
Dubowik, J.
Powiązania:: https://bibliotekanauki.pl/articles/1427432.pdf
Data publikacji:: 2012-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.70.-i
75.30.Et
75.30.Gw
75.70.Cn
76.50.+g
Opis:: Using cavity ferromagnetic resonance and vector network analyzer ferromagnetic resonance unidirectional, uniaxial and rotatable anisotropies were determined in permalloy(30 nm)/NiMn(56 nm). Resonance field dependence on in-plane angle clearly shows unidirectional and uniaxial anisotropy. Rotatable anisotropy, which acts as internal magnetic field independent of a direction of external magnetic field, is observed on vector network analyzer ferromagnetic resonance as upward shift of the resonance frequency of Py/NiMn compared to Py film. Even for a small exchange bias field, this shift is significantly large.
Źródło:: Acta Physica Polonica A; 2012, 121, 5-6; 1145-1147
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 64.

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

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Skocz do pozycji: 65.

Tytuł:: Multifunctional $La_{0.7}Sr_{0.3}MnO_3-YBa_2Cu_3O_7$ Heterostructures
Autorzy:: Przyslupski, P.
Dybko, K.
Tsarou, A.
Werner-Malento, K.
Sawicki, M.
Laviano, F.
Gozzellino, L.
Mezzetti, E.
Powiązania:: https://bibliotekanauki.pl/articles/1812263.pdf
Data publikacji:: 2008-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.25.Ha
74.78.Db
74.72.Bk
75.70.Cn
Opis:: Complex perovskite oxides exhibit a rich spectrum of functional responses such as: superconductivity, magnetism etc. Combination of different oxides in multilayered structures increases the number of physical responses. Heterogeneous oxide structures represent a new class of nanostructures. They consist of ferromagnetic $La_{0.67}Sr_{0.33}MnO_3$ (F-LSMO) manganite and superconducting $YBa_2Cu_3O_7$ (Sc-YBCO) cuprate. The interaction between the two order parameters gives rise to new physical effects. In this review we will discuss various physical effects obtained in the bilayer and trilayer heterostructures. For example, the LSMO/YBCO bilayer structures are used to study the mechanism of magnetic pinning. The other possibility is the fabrication of spin valve-like structures LSMO/YBCO/LSMO. The spin dependent transport in trilayer structure was studied taking into account crossed Andreev reflection and electron co-tunneling processes.
Źródło:: Acta Physica Polonica A; 2008, 114, 1; 15-22
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 66.

Tytuł:: Structure and Magnetic Characterization οf $BiFeO_3$/$YBa_2Cu_3O_7$ Bilayers
Autorzy:: Werner-Malento, K.
Tsarou, A.
Dluzewski, P.
Paszkowicz, W.
Minikayev, R.
Sawicki, M.
van der Beek, Kees
Konczykowski, M.
Przyslupski, P.
Powiązania:: https://bibliotekanauki.pl/articles/1810309.pdf
Data publikacji:: 2009-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.25.Ha
74.78.Fk
75.70.Cn
77.84.Bw
Opis:: Bilayered epitaxial $BiFeO_3$/$YBa_2Cu_3O_7$ films were fabricated on (100) $[(LaAlO_3)_{0.3}(Sr_2TaAlO_6)_{0.7}]$ substrates by sputtering method. For structural comparison the bilayered $BiFeO_3$/$La_{0.67}Sr_{0.33}MnO_3$ films were also deposited on (100) $SrTiO_3$ substrates. A weak ferromagnetic moment is observed in $BiFeO_3$/$YBa_2Cu_3O_7$ films. The mechanism responsible for weak ferromagnetic moment arises presumably from the epitaxy strain induced canted antiferromagnetic structure.
Źródło:: Acta Physica Polonica A; 2009, 115, 1; 95-97
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 67.

Tytuł:: From Magnetic Polarons to Ferromagnetism
Autorzy:: Dietl, T.
Powiązania:: https://bibliotekanauki.pl/articles/1968985.pdf
Data publikacji:: 1998-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.47.+p
75.70.Cn
78.55.Et
78.66.Hf
Opis:: A brief overview is given on selected effects of the exchange coupling between effective mass electrons and localized spins in II-VI semiconductors containing Mn ions. In the case of a carrier or exciton trapped by an impurity or defect, the exchange interaction leads to zero-field spin-splitting. The current theory of such complexes, known as bound magnetic polarons, describes correctly their spectroscopic and thermodynamic properties as well as their formation dynamics. At the same time, a free magnetic polaron - a delocalized carrier accompanied by a traveling cloud of polarized spins - is not expected to exist for the actual values of the coupling constants. However, hole scattering by thermodynamic and static fluctuations is shown to affect significantly its energy. For a strong coupling, the corresponding renormalization has to be described by a non-perturbative approach. Finally, the influence of the carrier liquid upon the Mn spins is discussed. Here, either optical pumping or p-type doping may lead to a ferromagnetic order, both in bulk and layered structures. Because of a long-range character of the carrier mediated interactions, this ordering is not destroyed by the fluctuations, even in the reduced dimensionality systems.
Źródło:: Acta Physica Polonica A; 1998, 94, 2; 111-123
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 68.

Tytuł:: Ferromagnetic Resonance Study of Exchange Coupled (Ga,Mn)As/GaAs/(Ga,Mn)As Heterostructures
Autorzy:: Dziatkowski, K.
Ge, Z.
Liu, X.
Furdyna, J. K.
Clerjaud, B.
Twardowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/2047381.pdf
Data publikacji:: 2007-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.50.Pp
76.50.+g
75.70.Cn
75.30.Et
85.75.-d
Opis:: Ferromagnetic resonance study of the exchange coupled (Ga,Mn)As/ GaAs/(Ga,Mn)As heterostructures is reported. The measurements were performed on the series of samples with varying thicknesses d$\text{}_{GaAs}$ of nonmagnetic GaAs spacer, established d$\text{}_{GaAs}$-dependent extent of weak and strong interlayer exchange coupling, judging on the observation of one or two ferromagnetic resonance modes.
Źródło:: Acta Physica Polonica A; 2007, 112, 2; 227-232
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 69.

Tytuł:: The Magnetic Equation of State and Transport Properties in Reduced Dimensions
Autorzy:: Warda, K.
Wojtczak, L.
Powiązania:: https://bibliotekanauki.pl/articles/1032847.pdf
Data publikacji:: 2017-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 64.30.Jk
64.60.-i
75.70.Cn
72.10.Fk
Opis:: Basing our considerations on magnetic equation of state applied to the description of magnetic systems of confined geometry we developed the model of calculations of the electrical resistivity for metallic multilayers. It was shown that in the transport of charge in ferromagnetic material d-electrons play an important role. The key parameters in the presented model are: the width of the electron energy band and the shift of the energy level for two spin orientations as well as the Fermi energy and size of the sample (the thickness of magnetic and nonmagnetic layers and the total number of layers). The presented results of calculations for temperature dependence of magnetoresistance are in qualitative agreement with the available experimental data. The model calculations introduced in this paper can be applied to current-in-plane geometry as well as to current-perpendicular-to-plane geometry. The calculations are valid within the limitations of the resistor network model.
Źródło:: Acta Physica Polonica A; 2017, 131, 4; 878-880
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 70.

Tytuł:: Signature of the Spin Triplet Phase in $La_{0.7}Sr_{0.3}MnO_3$/$Yba_2Cu_3O_7$/$La_{0.7}Sr_{0.3}MnO_3$ Trilayers
Autorzy:: Przyslupski, P.
Dybko, K.
Werner-Malento, K.
Aleshkevych, P.
Wojcik, M.
Sawicki, M.
Powiązania:: https://bibliotekanauki.pl/articles/1536907.pdf
Data publikacji:: 2010-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.25.Ha
74.78.Fk
75.70.Cn
77.84.Bw
Opis:: Differential dynamical subgap transport measurements were performed on LSMO/YBCO/LSMO trilayers to probe local evolution of the Andreev bound states which are manifested as the zero bias conductance peak. Dynamical conductivity dI/dV vs. magnetic field measured in current in plane and current perpendicular to plane geometries show nonmonotonic behavior with maximum at about 500 Oe. The shape of the zero bias conductance peak measured in current in plane geometry is sharp, whereas zero bias conductance peak measured in current perpendicular to plane geometry demonstrates V shape. These shapes of the zero bias conductance peak were predicted theoretically for unconventional p-wave spin triplet phase superconductor and superconductor with d-wave symmetry of the order parameter, respectively.
Źródło:: Acta Physica Polonica A; 2010, 118, 2; 313-315
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 71.

Tytuł:: Enhancement of Flux Pinning in the Superconductor-Ferromagnet Bilayer Nb(Co/Pd)
Autorzy:: Syryanyy, Y.
Zhu, L.
Cieplak, M.
Chien, C.
Powiązania:: https://bibliotekanauki.pl/articles/1537204.pdf
Data publikacji:: 2010-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.78.-w
74.78.Fk
74.25.Ha
75.70.Kw
75.70.-i
75.70.Cn
75.78.Fg
Opis:: The magnetometry and the magnetic force microscopy are used to study the influence of the magnetic domain size on the flux pinning in a superconducting/ferromagnetic bilayer (SFB), in which the S layer is niobium and the F layer is a Co/Pd multilayer with perpendicular magnetic anisotropy. The domain size is pre-defined using the angle-dependent demagnetization. The enhancement of pinning is found to be the strongest, up to a factor of 6, for narrow domains and small magnetic fields. This result differs from the behavior observed in the SFB in which the F layer is Co/Pt. The difference may be attributed to the degree of the disorder in the domain pattern.
Źródło:: Acta Physica Polonica A; 2010, 118, 2; 399-401
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 72.

Tytuł:: Equivalence of Mechanical and Magnetic Force in Magnetic Shape Memory Effect
Autorzy:: Kopecký, V.
Perevertov, O.
Straka, L.
Ševčík, M.
Heczko, O.
Powiązania:: https://bibliotekanauki.pl/articles/1402147.pdf
Data publikacji:: 2015-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.72.Mm
75.78.Fg
75.50.Cc
75.70.Cn
75.60.Ej
62.20.D-
Opis:: High mobility of twin boundary is crucial for magnetic shape memory effect. The twin boundary can be moved by applied magnetic field or mechanical stress. In Ni-Mn-Ga 10M martensite there are two different, field movable, a-c twin boundaries type I and II due to monoclinic lattice. For single twin boundary of both types we experimentally evaluated the equivalence of magnetic and mechanical force and the validity of generally used energy model using direct stress-strain and magnetization measurements. For type II, highly mobile twin boundary, the equivalence seems to be valid and model broadly agrees with measurement. However, for type I the calculated magnetic stress is much larger than mechanical stress needed for twin boundary motion.
Źródło:: Acta Physica Polonica A; 2015, 128, 4; 754-757
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 73.

Tytuł:: Interval Identification of FMR Parameters for Spin Reorientation Transition in (Ga,Mn)As
Autorzy:: Gutowski, M.
Stefanowicz, W.
Proselkov, O.
Sawicki, M.
Żuberek, R.
Sadowski, J.
Powiązania:: https://bibliotekanauki.pl/articles/1428597.pdf
Data publikacji:: 2012-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 07.05.Kf
68.47.Fg
75.30.Gw
75.50.Pp
75.70.-i
75.70.Ak
75.70.Cn
75.70.Rf
76.50.+g
Opis:: In this work we report results of ferromagnetic resonance studies of a 6% 15nm (Ga,Mn)As layer, deposited on (001)-oriented GaAs. The measurements were performed with in-plane oriented magnetic field, in the temperature range between 5 K and 120 K. We observe a temperature induced reorientation of the effective in-plane easy axis from $[\overline{1}10]$ to [110] direction close to the Curie temperature. The behavior of magnetization is described by anisotropy fields, $H_{eff}$ (=4π $M-H_{2⊥}$), $H_{2∥},$ and $H_{4∥}$. In order to precisely investigate this reorientation, numerical values of anisotropy fields have been determined using powerful - but still largely unknown - interval calculations. In simulation mode this approach makes possible to find all the resonance fields for arbitrarily oriented sample, which is generally intractable analytically. In "fitting" mode we effectively utilize full experimental information, not only those measurements performed in special, distinguished directions, to reliably estimate the values of important physical parameters as well as their uncertainties and correlations.
Źródło:: Acta Physica Polonica A; 2012, 121, 5-6; 1228-1230
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 74.

Tytuł:: Phase Transitions in Fe-Rh Alloys Induced by Temperature
Autorzy:: Rodionov, V.
Rodionova, V.
Annaorazov, M.
Powiązania:: https://bibliotekanauki.pl/articles/1386516.pdf
Data publikacji:: 2015-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 64.60.Cn
75.30.Kz
64.70.K-
Opis:: This research work was aimed to find the composition of equiatomic Fe-Rh alloy and to find the way of preparation of samples with extremely narrow thermal hysteresis and repeatable results. Alloys with content of Fe from 48 up to 52 at.% were examined. Fe-Rh alloys were prepared in forms of bulk piece, plate and wire. The plates of alloys were found to be more perspective for further investigations. The influence of parameters of ingot and samples treatments on antiferromagnetic-ferromagnetic transition was studied. The ways of narrowing of temperature hysteresis were established.
Źródło:: Acta Physica Polonica A; 2015, 127, 2; 445-447
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 75.

Tytuł:: Cavity Fields Approach to Simple Pseudospin Model of Orientational Glass
Autorzy:: De Cesare, L.
Lukierska-Walasek, K.
Rabuffo, I.
Walasek, K.
Powiązania:: https://bibliotekanauki.pl/articles/1964744.pdf
Data publikacji:: 1997-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 05.20.-y
64.60.Cn
64.70.Pf
75.10.Nr
75.50.Lk
Opis:: A simple infinite-range model of axial quadrupolar glass is investigated within the cavity-fields approach inside a pure state and a cluster of pure states. Working at a level of a pure state, the nonlinear susceptibility is derived. When a cluster of pure states is considered, all the known results of the one-step replica-symmetry breaking approach are easily reproduced. Besides, the nonlinear susceptibility and the stability conditions are obtained and related numerical results are presented. In this way the stability range of the replica-symmetry breaking solution, quite difficult to be derived within the replica method, is established on the purely physical ground. An interesting feature is that, at any considered stage, the nonlinear susceptibility diverges at a given temperature T$\text{}_{c}$ where the quadrupolarization and the quadrupolar glass order parameters are nonzero and finite. This may be interpreted as a signal of a glassy phase transition not in the Landau sense.
Źródło:: Acta Physica Polonica A; 1997, 92, 2; 411-414
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 76.

Tytuł:: Application of the SPin Glass Formalism to the Quadrupolar Glass Na(CN)$\text{}_{x}$Cl$\text{}_{1-x}$
Autorzy:: Walasek, K.
Powiązania:: https://bibliotekanauki.pl/articles/1930583.pdf
Data publikacji:: 1994-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 64.60.Cn
64.70.Pf
62.20.Dc
75.10.Nr
Opis:: A new model of quadrupolar glass of mixed alkali halide-cyanide crystals is proposed. This model is treated by the Sherrington-Kirkpatrick like procedure. Physical consequences of our approach are discussed. The temperature dependence of the quadrupolar Edwards-Anderson order parameter and elastic constant C$\text{}_{44}$ near the quadrupolar glass transition was obtained.
Źródło:: Acta Physica Polonica A; 1994, 85, 2; 377-380
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 77.

Tytuł:: Replica-Symmetry Broken Solution of Simple Pseudospin Model of Orientational Glass
Autorzy:: Walasek, K.
Lukierska-Walasek, K.
Wodawski, M.
Powiązania:: https://bibliotekanauki.pl/articles/1964736.pdf
Data publikacji:: 1997-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 62.20.Dc
64.60.Cn
64.70.Pf
75.10.Nr
Opis:: The first stage of the replica-symmetry breaking for a simple quadrupolar glass model using the Parisi ansatz has been performed in a wide range of temperatures including T = 0. It has been obtained that the entropy of the system increases considerably compared to that calculated within the replica symmetric theory.
Źródło:: Acta Physica Polonica A; 1997, 92, 2; 407-410
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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