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    Wyświetlanie 1-13 z 13
    Tytuł:
    Surface and Thin Film Magnetization of Isotropic and Anisotropic Heisenberg Ferromagnet at Low Temperatures
    Autorzy:
    Modrak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968931.pdf
    Data publikacji:
    1998-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.Ak
    75.30.Pd
    Opis:
    The independent random walk method (which is equivalent to the noninteracting spin wave method) with no further approximations was used to calculate the low temperature expansion of: (i) the local mean spin values of an isotropic Heisenberg ferromagnet for semi-infinite crystal and (ii) the spontaneous magnetization of an anisotropic Heisenberg ferromagnet for monolayer and double layer. The full low temperature expansion starting with T$\text{}^{3}\text{}^{/}\text{}^{2}$ term was obtained for the semi-infinite Heisenberg ferromagnet and it was shown that the spontaneous magnetization for thin films of anisotropic Heisenberg ferromagnets can exhibit a quasi-linear behaviour in certain temperature region related to the magnitude of the anisotropy.
    Źródło:
    Acta Physica Polonica A; 1998, 93, 5-6; 785-797
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
    Artykuł
    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
    Artykuł
    Tytuł:
    The Improvement of Atomic Force Microscope Suitable for Magnetic Domain Structure Measurements
    Autorzy:
    Sveklo, I.
    Dobrogowski, W.
    Kisielewski, M.
    Maziewski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013164.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.-i
    75.30.Pd
    61.16.Ch
    Opis:
    Based on commercial Burleigh METRIS$\text{}^{TM}$-2000 Atomic Force Microscope two methods of magnetic force measurements were realised. The developed system was successfully applied for study of magnetic structure of both YIG-garnet and CoNi/Pt magneto-optic multilayers.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 527-530
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    IINS, MIR, and DFT Investigations of Vibrational Spectra of 3,3-Dimethyl-1-Butanol and 3,3-Dimethyl-2-Butanol
    Autorzy:
    Juszyńska, E.
    Hołderna-Natkaniec, K.
    Massalska-Arodź, M.
    Natkaniec, I.
    Ściesińska, E.
    Ściesiński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813169.pdf
    Data publikacji:
    2008-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.15.Pd
    78.70.Nx
    33.20.Ea
    Opis:
    Molecular vibrational spectra in 3, 3-dimethyl-1-butanol, $(CH_3)_3$ $CCH_2CH_2OH$, and 3, 3-dimethyl-2-butanol, $(CH_3)_3CCHOHCH_3$, were measured by the inelastic incoherent neutron scattering and mid infrared spectroscopy and for 3, 3-dimethyl-2-butanol additionally by the far infrared absorption method. Experimental results were discussed and compared with the results of the quantum chemical calculations performed by the density functional theory (DFT/B3LYP/6-311G**) and semi-empirical PM3 calculation methods assuming the isolated molecule approximation.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 4; 1131-1143
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Invasive vs. Non-Invasive Methods in Estimating Slope Stability, with Application in the Copou Area, Iaşi, Romania
    Autorzy:
    Pascariu, F.
    Negru, C.
    Şaramet, M.
    Chelariu, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401973.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    91.30.pd
    91.62.Ty
    92.40.Ha
    Opis:
    Slope stability analysis represents nowadays a constant pursuit, being applied in various domains, such as geological and geomorphological studies, civil engineering or urban expansion. In this paper, two different methods were employed in order to establish the stability of the Copou Hill, Iaşi, Romania, and the results were compared. The first, non-invasive, method involves obtaining a landslide risk map by identifying the factors that induce the slope failure and overlaying the obtained maps. The second one, invasive, implies computing a safety factor using the infinite slope method, employing well data from this area and ranging the thickness of the water column. This comparison was made in order to improve the non-invasive method, so as to apply it in areas where there is no geological information. The resulting landslide risk map shows values of the average coefficient Kₘ ranging between 0.21 and 0.63, implying a medium to high failure probability for the studied slope. On the other hand, the infinite slope method indicates a safety factor with values between 0.91 and 1.49, at a complete flooding of the land-sliding lithological column, with a single exception with much lower value. These values are below the admissible factor, suggesting failure with a medium to high probability. Comparing these two methods, significant similarities between the landslide risk map results and the computed safety factors can be observed. For further testing of the first method, similar studies should also be made in other areas.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-193-B-196
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of Positron Annihilation Response to Mechanical Deformation of Nanostructured AgCo
    Autorzy:
    Melikhova, O.
    Kuriplach, J.
    Čížek, J.
    Procházka, I.
    Hou, M.
    Pisov, S.
    Zhurkin, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812541.pdf
    Data publikacji:
    2008-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    71.15.Pd
    61.46.Hk
    Opis:
    Nanostructured materials attract nowadays a broad attention due to their specific properties. Defects play an essential role in material properties so their characterisation is very important. The evolution of the various open volume defects in AgCo nanowire modelled samples obtained using molecular dynamics was studied. Isothermal and isoenergetic deformation mechanisms are considered. General analyses of open volume defects concerning their size and their chemical environment were performed. Positron lifetimes, binding energies, and high momentum parts of the momentum distribution of annihilationγ-quanta were calculated for selected defects.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 5; 1455-1464
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polarized Neutron Reflection: A Technique to Study Magnetization Profiles at Surfaces and Interfaces
    Autorzy:
    Felici, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929395.pdf
    Data publikacji:
    1993-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.25.+z
    75.30.Pd
    75.60.Ej
    Opis:
    The interaction of a neutron beam at grazing angle of incidence can be well described by the use of laws of classical optics when a refractive index is introduced. This follows from the undulatory nature of neutrons and from their interaction potential with matter. For polarized neutrons a magnetic material acts as a birefringent material and a magnetization profile can be inferred from reflectivity measurements. In this paper we will briefly describe the theory of polarized neutron reflection and some applications of this technique to study superconductors, thin and granular magnetic films.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 1; 193-202
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spontaneous Surface Magnetisation of Single Crystal MnF$\text{}_{2}$ in the Antiferromagnetic State
    Autorzy:
    Nizhankovskii, V. I.
    Khar'kovskii, A. I.
    Zaleski, A. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013077.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Pd
    75.25.+z
    75.50.Ee
    Opis:
    Spontaneous magnetisation of (100) and (010) surfaces of a MnF$\text{}_{2}$ single crystal in the antiferromagnetic state is discovered. A sign of the surface magnetisation is determined by a difference in dielectric constants ε of MnF$\text{}_{2}$ and ambient matter: magnetisation is directed to the substance with a smaller ε.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 487-490
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spin Waves in Antiferromagnetically Coupled Multilayers
    Autorzy:
    Mingozzi, M.
    Donzelli, O.
    Ngaboyisonga, J. M. V.
    Nizzoli, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1953181.pdf
    Data publikacji:
    1997-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Pd
    75.70.Cn
    75.70.-i
    Opis:
    We investigate how the static and dynamical magnetic properties of Fe/Cr finite superlattices with antiferromagnetic coupling depend on the ratio between the uniaxial anisotropy constant and the interlayer exchange constant of Fe films. The spin waves are calculated by considering dipole interaction, intralayer and interlayer exchange coupling, uniaxial anisotropy, in presence of an external field. The calculated spectra are compared with recent experimental Brillouin scattering data which exhibit two spin waves peaks.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 1; 213-216
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Light Scattering Investigations of Magnetic Anisotropies in Ultrathin Epitaxial Co Films
    Autorzy:
    Hillebrands, B.
    Krams, P.
    Fassbender, J.
    Mathieu, C.
    Güntherodt, G.
    Jungblut, R.
    Johnson, M. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1861065.pdf
    Data publikacji:
    1994-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Gw
    75.30.Pd
    75.30.Ds
    78.35.+c
    Opis:
    Using Brillouin light scattering, the properties of magnetic anisotropies in ultrathin epitaxial Co films grown on single-crystal Cu substrates are investigated. All relevant magnetic anisotropy contributions are determined, in situ in an ultrahigh vacuum system for the (001)-oriented films, as well as ex situ for other film orientations, which are covered with a Cu cap layer. For (001)-oriented films we find a large in-plane anisotropy contribution of fourfold symmetry. For this contribution the volume and the surface part cancel to zero at the same thickness as found for the onset of ferromagnetic order. This finding is indicative for a stabilization of ferromagnetic order in Co/Cu(001) by in-plane anisotropy contributions. In (1 1 13)-oriented films, which are composed of (001)-terraces aligned along the [11̅0]-direction and spaced by 6.5 atomic distances, an additional uniaxial in-plane anisotropy contribution is found which is identified as being of magneto-elastic origin. For (110)-oriented films three ranges of thickness dependence of the in-plane and out-of-plane anisotropy contributions are found which correlate in the thin-film regime with the growth properties. (111)-oriented films show a linear dependence of the perpendicular anisotropy on the reciprocal film thickness over the full investigated thickness range of 2 to 20 Å.
    Źródło:
    Acta Physica Polonica A; 1994, 85, 1; 179-193
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of Charge States of Indium Vacancies in InP
    Autorzy:
    LiMing, W.
    Fung, S.
    Beling, C. D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2008114.pdf
    Data publikacji:
    1999-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.15.Mb
    71.15.Pd
    71.55.Eq
    78.70.Bj
    Opis:
    The autocorrelation functions of positron-electron pairs in InP with indium vacancies in different charge states are calculated in this work. It is found that the autocorrelation function can be used to identify the charge states of vacancies in solids. In the case of perfect lattice the autocorrelation function oscillates on the lattice with the periodicity of the lattice and decays gradually up to about the third layer of the lattice points. In the case of neutral vacancies, the central peak expands significantly, but the nearest peak and dip are greatly reduced. In the case of negative charge states of vacancies, the central peak, however, contracts slightly compared to the case of the perfect lattice, and the nearest peak and dip and the next-nearest peak nearly disappear.
    Źródło:
    Acta Physica Polonica A; 1999, 95, 4; 612-614
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ion Beam Formation of Electrocatalysts for Direct Methanol and Ethanol Fuel Cells on the Basis of Carbon Catalyst Supports
    Autorzy:
    Poplavsky, V.
    Dorozhko, A.
    Luhin, V.
    Matys, V.
    Zukowski, P.
    Czarnacka, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033764.pdf
    Data publikacji:
    2017-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.37.Hk
    81.15.Jj
    81.05.U-
    82.45.Jn
    82.80.Fk
    82.80.Yc
    88.20.ff
    88.30.pd
    88.30.pf
    Opis:
    Ion-beam modification of materials whose service properties are mainly controlled by the surface composition is of especial interest, in particular, for electrocatalysts, namely electrodes of fuel cells - perspective chemical current sources. A catalyst is needed for effective operation of fuel cell. In this paper active layers of the electrocatalysts were prepared by ion beam assisted deposition of catalytic (platinum) and activating (cerium) metals onto carbon (AVCarb® Carbon Fiber Paper P50 and Toray Carbon Fiber Paper TGP-H-060 T) catalyst supports. Formation of layers by ion beam assisted deposition by means of the deposition of metal and mixing of precipitating layer with the substrate by accelerated ions of the same metal, was carried out. Metal deposition and mixing between the precipitable layer and surface of the substrate by accelerated (U=10 kV) ions of the same metal were conducted from a neutral vapor fraction and plasma of vacuum arc discharge of a pulsed electric arc ion source. Study of the morphology and composition of layers was carried out by the scanning electron microscopy, energy dispersive X-ray microanalysis, X-ray fluorescence analysis, and the Rutherford backscattering spectrometry methods. According to the investigations with the use of cyclic voltammetry, the electrocatalysts with the prepared layers exhibited catalytic activity in the reactions of electrochemical oxidation of methanol and ethanol, which form the basis for the principle of operation of low temperature direct methanol and direct ethanol fuel cells.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 2; 278-282
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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