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    Wyświetlanie 1-15 z 15
    Tytuł:
    SWR Studies of Higher-Order Surface Anisotropy Terms in (Ga,Mn)As Thin Films
    Autorzy:
    Puszkarski, H.
    Tomczak, P.
    Diep, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030424.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    76.50.+g
    75.70.-i
    75.30.Ds
    76.60.-k
    Opis:
    We extend the theory of spin-wave resonance (SWR) by introducing a new formula representing the surface pinning parameter as a series of contributions from different anisotropies existing in (Ga,Mn)As thin films. Comparing our theory with the reported experimental studies of SWR in thin films of the ferromagnetic semiconductor (Ga,Mn)As, we find that besides the first-order cubic anisotropy, higher-order cubic anisotropies (in the second and third orders) as well as uniaxial anisotropies (perpendicular in the first and second orders, and in-plane diagonal) occur on the surface of this material. To our best knowledge this is the first report of the existence of higher-order surface anisotropy fields in (Ga,Mn)As thin films.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 635-638
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface Magnetic Anisotropy of Epitaxial La$\text{}_{0.7}$Mn$\text{}_{1.3}$O$\text{}_{2.84}$ Thin Films
    Autorzy:
    Aleshkevych, P.
    Baran, M.
    Dyakonov, V.
    Szymczak, R.
    Szymczak, H.
    Baberschke, K.
    Lindner, J.
    Lenz, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046886.pdf
    Data publikacji:
    2006-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.50.+g
    75.70.-i
    Opis:
    A spin-wave resonance technique was used to collect information on elementary magnon excitations in high quality epitaxial La$\text{}_{0.7}$Mn$\text{}_{1.3}$O$\text{}_{2.84}$ films prepared by dc-magnetron sputtering. It was found that besides bulk spin-wave modes, the spin-wave resonance spectrum includes also the surface spin waves. The value of spin-wave stiffness constant D=156 meV·Å$\text{}^{2}$ was found. The values of the surface magnetic anisotropy on both surfaces and their angular dependence were determined. The experimentally found spin-wave resonance spectra were explained based on the surface-inhomogeneity model. The effect of surface anisotropy on the spin-wave excitation conditions in epitaxial La$\text{}_{0.7}$Mn$\text{}_{1.3}$O$\text{}_{2.84}$ films was investigated. Spin-wave resonance data give an indirect evidence of periodic charge-ordered stripes formation.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 1; 57-70
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ferromagnetic Resonance in Metallic Thin Films and Thin-Film Tubes
    Autorzy:
    Dubowik, J.
    Gościańska, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813601.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.-i
    75.30.Gw
    76.50.+g
    Opis:
    A model describing ferromagnetic resonance in thin-film magnetic metallic tubes is proposed and compared with the experimental ferromagnetic resonance spectra of the thin-film Ni.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 179-182
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Interpretation of the Angular Dependence of the Main FMR/SWR Line in Ferromagnetic Thin Films
    Autorzy:
    Puszkarski, H.
    Kasperski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1427526.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.50.+g
    75.70.-i
    Opis:
    The reported measurements of the angular dependence of ferromagnetic resonance spectra and their theoretical interpretation lead to the observation that a discrepancy occurs between the theory and the experiment in certain ranges of the configuration angle. This disagreement cannot be eliminated within the Smit-Beljers model commonly used in the literature for the description of ferromagnetic resonance in thin films since the main ferromagnetic resonance line observed in thin films is not necessarily associated with the excitation of a uniform mode, as the Smit-Beljers model does assume for bulk samples. Instead, we associate this line with the excitation of a surface mode or the thin-film principal nonuniform mode. By taking into account the occurrence of a surface spin-pinning anisotropy, this assumption allows to obtain an agreement between the theoretical description of the ferromagnetic resonance and the experimental data in the whole range of angular configuration of the external field. As an example, on the basis of this modified ferromagnetic resonance model, we make some observations on the angular resonant dependence in uniaxial thin films.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1165-1168
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Low Concentration Effect of Fe$\text{}_{3}$O$\text{}_{4}$ and Fe$\text{}_{3}$C Magnetic Nanoparticles in Non-Magnetic Matrix on the FMR Spectra
    Autorzy:
    Bodziony, T.
    Guskos, N.
    Roslaniec, Z.
    Narkiewicz, U.
    Kwiatkowska, M.
    Maryniak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043572.pdf
    Data publikacji:
    2005-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.50.+g
    75.70.-i
    Opis:
    PTMO-block-PET polymer filled with a low concentration (0.1 wt.%) of binary magnetic system: magnetite (Fe$\text{}_{3}$O$\text{}_{4}$) and iron carbide (Fe$\text{}_{3}$C) with carbon (C) was prepared. Characterization of the sample was done by using X-ray diffraction and scanning electron microscopy methods. Temperature dependence of the FMR spectra was carried out in the 10-300 K temperature range. The extraordinary temperature dependence behaviour of FMR spectra was recorded. The FMR spectra were fitted by two Lorentzian lines originating from magnetite and iron carbide. The anomalous behaviour of FMR spectra below 100 K could be explained by the skin effect or by the freezing of the matrix benzene rings at about 115 K. The temperature dependence of the g parameter below 75.5 K (opposite shift of the resonance field to usually observed) was interpreted as a result of strong antiferromagnetic interaction of some portion of agglomerates.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 2; 297-302
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theory of Nonlinear Ferromagnetic Resonance in the Samples with Magnetostatic and Exchange Boundary Conditions Imposed
    Autorzy:
    Krawiecki, A.
    Sukiennicki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929206.pdf
    Data publikacji:
    1993-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.50.+g
    75.30.Ds
    75.70.-i
    Opis:
    General theory of nonlinear ferromagnetic resonance is presented for samples with the usual magnetostatic and exchange boundary conditions imposed at the sample surface. In such samples the Suhl instabilities and other nonlinear effects occur due to nonlinear interactions of magnetostatic or dipole-exchange modes. All relevant types of interactions are included in the Hamiltonian: with the pumping field, three- and four-mode ones. Analytic calculation of the Suhl thresholds in the three possible types of instabilities in perpendicular and parallel pumping is performed for the sample in the shape of a thin slab.
    Źródło:
    Acta Physica Polonica A; 1993, 83, 4; 505-515
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnon Excitations in Manganites
    Autorzy:
    Aleshkevych, P.
    Baran, M.
    Szymczak, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038387.pdf
    Data publikacji:
    2004-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Ds
    75.47.Lx
    75.70.-i
    76.50.+g
    Opis:
    A review of experimental studies of magnon excitations in manganites is presented. Two kinds of techniques: the inelastic neutron scattering (in bulk materials) and the microwave resonance (in thin films) are considered. Experimental studies of spin dynamics by inelastic neutron scattering in metallic ferromagnetic manganites have shown that at low temperature for small wave vectors k → 0 the dispersion relation has a quadratic shape similar to that observed in Heisenberg ferromagnets. However, the above technique although very informative can be used only for sufficiently large samples of bulk materials. A complementary microwave resonance technique allows studying not only bulk properties, but also surface properties. There are two main theoretical approaches used to interpret the spin wave resonance spectra: the volume inhomogeneity and the surface inhomogeneity models. The last one introduced by Puszkarski has allowed for interpretation of the observed surface magnon excitations in thin films.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 5; 593-602
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Existence Conditions of Surface Spin Wave Modes in (Ga,Mn)As Thin Films
    Autorzy:
    Puszkarski, H.
    Tomczak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398676.pdf
    Data publikacji:
    2016-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    76.50.+g
    75.70.-i
    75.30.Ds
    Opis:
    Spin-wave resonance is a newly emerged method for studying surface magnetic anisotropy and surface spin-wave modes in (Ga,Mn)As thin films. The existence of surface spin-wave modes in (Ga,Mn)As thin films has recently been reported in the literature; surface spin-wave modes have been observed in the in-plane configuration (with variable azimuth angle $\phi_M$ between the in-plane magnetization of the film and the surface [100] crystal axis), in the azimuth angle range between two in-plane critical angles $\phi_{c1}$ and $\phi_{c2}$. We show here that cubic surface anisotropy is an essential factor determining the existence conditions of the above-mentioned surface spin-wave modes: conditions favorable for the occurrence of surface spin-wave modes in a (Ga,Mn)As thin film in the in-plane configuration are fulfilled for those azimuth orientations of the magnetization of the sample that lie around the hard axes of cubic magnetic anisotropy. This implies that a hard cubic anisotropy axis can be regarded in (Ga,Mn)As thin films as an easy axis for surface spin pinning.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 1; 117-120
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model for the Surface Anisotropy Field Observed in Spin-Wave Resonance in (Ga,Mn)As Thin Films
    Autorzy:
    Puszkarski, H.
    Tomczak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1386858.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    76.50.+g
    75.70.-i
    75.30.Ds
    Opis:
    In this study we show why spin-wave resonance in a (Ga,Mn)As thin film may, in different conditions, meet the assumptions of either the surface inhomogeneity (SI) or the volume inhomogeneity (VI) model.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 508-510
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
    Artykuł
    Tytuł:
    Temperature Dependence of Exchange Anisotropy of FeNi/FeMn Bilayers
    Autorzy:
    Żuberek, R.
    Gutowski, M.
    Szymczak, H.
    Gnatchenko, S.
    Merenkov, D.
    Bludov, A.
    Verkin, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813596.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.21.Ac
    75.30.Et
    75.70.-i
    76.50.+g
    Opis:
    The influence of the bilinear and biquadratic coupling on the exchange anisotropy of the ferromagnetic/antiferromagnetic bilayer was studied by variable angle and temperature dependent ferromagnetic resonance. From the angular dependence of the resonance field the bilinear and biquadratic exchange coupling constants were determined.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 167-170
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Complex Magnetic Structure of Strongly Coupled Fe/Si Multilayers
    Autorzy:
    Dubowik, J.
    Stobiecki, F.
    Szymański, B.
    Kudryavtsev, Yu. V.
    Grabias, A.
    Kopcewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013056.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.-i
    68.55.-a
    76.50.+g
    Opis:
    Fe/Si multilayers with strong bilinear and biquadratic couplings were investigated. A complex structure revealed by the Mössbauer spectroscopy corresponds to multimode ferromagnetic resonance spectra in a non-saturated state. Simple dispersion relations for antiferromagnetic coupled bilayer structures are shown to be inapplicable to the Fe/Si multilayers with a strong biquadratic component to the antiferromagnetic bilinear coupling.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 451-454
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interval Computations of Ferromagnetic Resonance Conditions in Exchange-Biased Bilayers
    Autorzy:
    Gutowski, M.
    Żuberek, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810606.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    02.70.-c
    73.21.Ac
    75.30.Et
    75.70.-i
    76.50.+g
    Opis:
    The main purpose of this paper is to promote the use of interval calculus in physics. As an example we use the system consisting of two thin films, one ferromagnetic and another one antiferromagnetic, deposited one atop of the other. We successfully and accurately simulate the positions of resonance fields of such a system, as seen in ferromagnetic resonance experiment. Interval calculations have revealed the presence of 1, 2 and sometimes even 4 distinct equilibrium configurations of the system, all corresponding to the same resonance field, when the field has a component antiparallel to that of cooling field, while only 1 such position when it points in the opposite direction. In both cases only a single resonance line is observed. As an added value we show that the exchange-biased system is in the metastable state, out of true thermodynamical equilibrium.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 390-392
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electric and Magnetic Signatures of Structural and Chemical Ordering of Heusler Alloy Films
    Autorzy:
    Dubowik, J.
    Gościańska, I.
    Załęski, K.
    Kudryavtsev, Y.
    Lee, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810587.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.80.Ng
    73.61.-r
    75.70.-i
    76.50.+g
    Opis:
    We present results of in situ temperature measurements of resistivity for some amorphous or partially crystalline Heusler alloy films: $Co_{2}CrAl$, $Co_{2}MnGa$ and off-stoichiometric $Ni_{2}Mn_{1+x}Sn_{x}$, $Ni_{2}Mn_{1-x}Ga_{x}$ that are known to exhibit half-metallic properties and martensitic transformations, respectively. From ρ vs. T characteristics we distinguish various stages of chemical and structural ordering in the films. They appear to be quite distinct in both systems investigated. The resistivity results are compared with magnetic characteristics for $Co_{2}MnGa$ with a high Curie temperature.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 360-362
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
    Artykuł
      Wyświetlanie 1-15 z 15

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