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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:
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:
Synchrotron Mössbauer Reflectometry - Recent Applications in Multilayer Magnetism
Autorzy:
Nagy, D. L.
Bottyán, L.
Deák, L.
Major, M.
Powiązania:
https://bibliotekanauki.pl/articles/2028927.pdf
Data publikacji:
2001-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.70.-i
75.25.+z
75.30.Gw
76.80.+y
Opis:
Grazing incidence nuclear resonant scattering of synchrotron radiation (synchrotron Mössbauer reflectometry) has recently been efficiently applied to study the magnetic structure of multilayers. Principles and recent experiments of synchrotron Mössbauer reflectometry are briefly reviewed. The orientation of the layer magnetization in an antiferromagnetically coupled multilayer is determined both from time-integral and time-differential specular synchrotron Mössbauer reflectometry experiments. Spin-flop phenomena are studied. Off-specular (diffuse) scattering gives information on the in-plane antiferromagnetic domain structure.
Źródło:
Acta Physica Polonica A; 2001, 100, 5; 669-678
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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:
Spin-Peierls Transition in $(N-Me-Tetra-Me-Pz)(TCNQ)_{2}$
Autorzy:
Kajňaková, M.
Botko, M.
Starodub, V.
Čižmár, E.
Feher, A.
Powiązania:
https://bibliotekanauki.pl/articles/1368650.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.60.i
75.10.Jm
75.50.Xx
76.30.v
Opis:
The new organic anion-radical salt $(N-Me-Tetra-Me-Pz)(TCNQ)_{2}$, (Pz = pyrazine) was studied as a low dimensional magnetic system. Heat capacity and EPR studies were performed in the temperature range from 2 to 300 K. The magnetic susceptibility was measured in the temperature range from 2 to 300 K and in magnetic fields of 100 mT and 1 T. The magnetic properties of this new system can be described as a dimerized Heisenberg spin S=1/2 chain possessing a spin-Peierls transition at 42 K.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 254-255
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin Reorientation Studies in Nd$\text{}_{2}$Fe$\text{}_{14-x}$Si$\text{}_{x}$B (0
Autorzy:
Gargula, R.
Pędziwiatr, A.
Bogacz, B.
Wróbel, S.
Bartolomé, J.
Stankiewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/2030427.pdf
Data publikacji:
2002-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Ww
76.80.+y
64.60.-i
Opis:
Nd$\text{}_{2}$Fe$\text{}_{14-x}$Si$\text{}_{x}$B (x=0.25, 0.5, 0.75, 1.0, 1.5, 2.0) intermetallic compounds were investigated by magnetometry, $\text{}^{57}$Fe Mössbauer effect, electric resistivity, and differential scanning calorimetry mainly in the vicinity of the spin reorientation temperature, T$\text{}_{SR}$. The Curie temperature, T$\text{}_{C}$, and T$\text{}_{SR}$ were determined for different compositions and the spin phase diagram was constructed. $\text{}^{57}$Fe Mössbauer spectra showed noticeable changes in the reorientation region. For temperatures above the transition, the spectra were analysed using 6 Zeeman patterns associated with 6 inequivalent crystal sites in Nd$\text{}_{2}$Fe$\text{}_{14}$B according to site occupations (16k$\text{}_{1}$:16k$\text{}_{2}$:8j$\text{}_{1}$:8j$\text{}_{2}$:4c:4e). In the transition region, 12 subspectra had to be incorporated in the analysis. Electric resistivity measurements showed a typical metallic behaviour with no anomalies in the magnetic transition region. Differential scanning calorimetry measurements revealed broad endothermic two stage peaks around T$\text{}_{SR}$.
Źródło:
Acta Physica Polonica A; 2002, 101, 2; 289-294
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quasicritical Behaviour of the NMR and µSR Relaxation in YMn$\text{}_{2}$D$\text{}_{x}$
Autorzy:
Paja, A.
Mietniowski, P.
Figiel, H.
Powiązania:
https://bibliotekanauki.pl/articles/2013711.pdf
Data publikacji:
2000-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.40.-s
76.60.-k
76.75.+i
Opis:
The magnetic and structural properties of YMn$\text{}_{2}$ are strongly influenced by introduction of hydrogen (deuterium) in the structure, however, it only slightly modifies the noncollinear antiferromagnetic structure of the compound. The temperature dependences of the NMR relaxation times T$\text{}_{1}$ and T$\text{}_{2}$ of deuterium and the zero-field relaxation of muons in YMn$\text{}_{2}$D$\text{}_{x}$ were measured at temperatures above the magnetic ordering temperature T$\text{}_{N}$. The corresponding relaxation rates are described by the empirical expression (T/T$\text{}_{N}$-1)$\text{}^{-η}$, where the exponent η increases linearly with deuterium concentration x. To explain this behaviour, the Moriya theory of spin fluctuations was used. The expressions for NMR and μSR relaxation rates have been calculated. The resultant formulae agree well with the experiment, giving reasonable values of fitting parameters. The results obtained are discussed in terms of spin fluctuation excitation spectrum.
Źródło:
Acta Physica Polonica A; 2000, 97, 5; 867-870
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phase Composition and Magnetic Properties of Nanoperm Thin Films Doped with Yttrium
Autorzy:
Brzózka, K.
Sovák, P.
Szumiata, T.
Górka, B.
Gawroński, M.
Powiązania:
https://bibliotekanauki.pl/articles/1428972.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Bb
75.70.-i
76.80.+y
78.20.Ls
Opis:
Thin films of Nanoperm alloys with partial substitution of iron by yttrium are the subject of investigations. The attention is fixed on the influence of yttrium substitution on structure and magnetic characteristics of the samples. The effect of film thickness is also considered. Conversion electron Mössbauer spectroscopy and magneto-optic Kerr effect were used to derive hyperfine parameters and coercive field, respectively. Coexistence of crystalline bcc-Fe phase and an amorphous one with diverse proportion was stated in most of the samples. It was found that surface and interface regions contribute to the magnetic properties of films.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1270-1272
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:
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:
Muon Spin Rotation Studies of the Vortex Matter in the High-T$\text{}_{c}$ Superconductor Bi$\text{}_{2}$Sr$\text{}_{2}$CaCu$\text{}_{2}$O$\text{}_{8+δ}$
Autorzy:
Blasius, T.
Niedermayer, Ch.
Tallon, J. L.
Pooke, D. M.
Golnik, A.
Noakes, D. R.
Stronach, C. E.
Ansaldo, E. J.
Henn, R. W.
Lin, C. T.
Bernhard, C.
Powiązania:
https://bibliotekanauki.pl/articles/2011022.pdf
Data publikacji:
1999-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.60.Ge
74.25.Dw
74.72.Hs
76.75.+i
Opis:
We report muon spin rotation studies of the magnetic field distribution n(B) in the vortex state of the high-temperature superconductor Bi$\text{}_{2}$Sr$\text{}_{2}$CaCu$\text{}_{2}$O$\text{}_{8+δ}$. From our data on three sets of overdoped, nearly optimized and underdoped single crystals we obtain evidence for a two-stage melting process of the vortex matter under equilibrium conditions. In the irreversible regime well below the irreversibility line we observe a transition in the vortex state which we associate with an intra-planar melting transition. The resulting flux-line liquid phase persists over a sizeable temperature interval before the inter-planar decoupling of the individual vortex lines takes place in a second step at the irreversibility line, resulting in a pancake liquid phase.
Źródło:
Acta Physica Polonica A; 1999, 96, 2; 245-258
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Muon Spin Rotation Studies of Doping in High-T$\text{}_{c}$ Superconductors
Autorzy:
Niedermayer, Ch.
Powiązania:
https://bibliotekanauki.pl/articles/2011019.pdf
Data publikacji:
1999-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Ha
74.62.Dh
76.75.+i
Opis:
Muon spin rotation studies on high temperature superconducting cuprates will be reviewed. After an introduction to the technique, studies on the superfluid density will be described and the universal variation of the superfluid density n$\text{}_{s}$ as a function of p will be presented. Important exceptions will be discussed, such as the YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ system, where, besides the intrinsically superconducting CuO$\text{}_{2}$ planes, an interlayer may be metallised (here the CuO chains) which consequently contributes to a significant enhancement in superfluid density and associated improvement in technologically interesting properties such as flux pinning and critical current density. Evidence for an unconventional pairing state, possibly with d-wave symmetry, is presented from studies of the rapid suppression of superfluid density due to the substitution of structural inhomogeneities (such as Zn) that introduce strong scattering centers within the CuO$\text{}_{2}$ planes. Finally, the phase diagram of the antiferromagnetic correlations and, in particular, their coexistence with the superconducting state, will be discussed in terms of muon spin rotation experiments in zero external magnetic field.
Źródło:
Acta Physica Polonica A; 1999, 96, 2; 213-227
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Muon Spin Rotation in High T$\text{}_{c}$ Superconductors
Autorzy:
Golnik, A.
Powiązania:
https://bibliotekanauki.pl/articles/1929391.pdf
Data publikacji:
1993-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.75.+i
74.72.-h
74.25.Ha
Opis:
A review of the muon spin rotation studies on high temperature superconductors is presented, with the special emphasis on the investigations of the magnetic ordering and spin-spin correlations in these materials.
Źródło:
Acta Physica Polonica A; 1993, 84, 1; 165-192
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mössbauer and MFM Investigations of Surface Magnetism in NANOPERM Nanocrystalline Alloys
Autorzy:
Miglierini, M.
Pavúk, M.
Powiązania:
https://bibliotekanauki.pl/articles/1382311.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.80.+y
68.37.Rt
75.60.Ch
75.70.i
71.55.Jv
Opis:
Structurally different surface regions are identified at both sides of the ribbon-shaped $\text{}^{57}Fe_{90}Zr_{7}B_{3}$ NANOPERM alloy. Though paramagnetic in the as-quenched state, the air side shows significant contribution of crystalline bcc-Fe that decreases towards the interior of the ribbon. After annealing at 480 °C, magnetic dipole interactions develop that are associated with enhanced number of ferromagnetic nanograins. Significant increase in the number of nanograins was revealed at the wheel side, while the one at the air side is almost saturated. The observed maze-type magnetic domains exhibit well developed structure with equally wide strips.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 124-125
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 30

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