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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kolbysheva O. P., Sadreev A. F.
Заглавие : The coupling of solitons via phonons in the phi-4-phi-2-model
Место публикации : Zhurnal Eksperimentalnoi Teor. Fiz. - 1991. - Vol. 100, Is. 4. - P.1262-1271. - ISSN 0044-4510
Примечания : Cited References: 9
Аннотация: The indirect coupling of solitons via phonons in the one-dimensional model phi-4-phi-2, as well as the coupling of plane domain walls in the d-dimensional model are analyzed. Both analytically and numerically, the indirect coupling is shown to be repulsive and significantly more long-range than the static coupling of solitons. The soliton coupling involving the soliton pinning is considered as well.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zobov V. E., POPOV M. A.
Заглавие : Dynamics in the systems with the 3-spin coupling induced by the strong radiofrequency field
Место публикации : Zhurnal Eksperimentalnoi Teor. Fiz. - 1993. - Vol. 103, Is. 6. - P.2129-2141. - ISSN 0044-4510
Примечания : Cited References: 24
Предметные рубрики: RESONANCE
LINE
Аннотация: The dynamics of the crystal nucleus spin system in constant and continuous strong radiofrequency magnetic fields is studied. The variation of the relaxation properties of the magnetization perpendicular to the effective field is studied with changing the field orientation in the rotating frame of coordinates and with changing the relation in the mean hamiltonian of two- and three-spin dipole-dipole couplings. The third and fourth moments of the NMR spectrum in the rotating frame of coordinates and the free precession fall are calculated by means of the memory function. The connection between the three-spin coupling and the features of such falls observed in the experiments under magic angle and bias from it is explained.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ignatchenko V. A., DEICH L. I.
Заглавие : Disorder-induced resonance coupling of waves
Разночтения заглавия :авие SCOPUS: Disorder-induced resonance coupling of waves
Место публикации : Phys. Rev. B. - 1994. - Vol. 50, Is. 22. - P.16364-16372. - ISSN 0163-1829, DOI 10.1103/PhysRevB.50.16364
Примечания : Cited References: 8
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S.
Заглавие : Static and dynamic magnetic properties of coupled spin-1/2 antiferromagnetic chains
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2000. - Vol. 12, Is. 37. - P.8191-8207. - ISSN 0953-8984, DOI 10.1088/0953-8984/12/37/316
Примечания : Cited References: 21
Предметные рубрики: ONE-DIMENSIONAL ANTIFERROMAGNETS
SYSTEMS
SUSCEPTIBILITY
EXCITATIONS
SR2CUO3
CA2CUO3
KCUF3
Ключевые слова (''Своб.индексиров.''): computational methods--copper compounds--correlation methods--functions--magnetic field effects--magnetic properties--magnetization--monte carlo methods--quantum theory--specific heat--thermal effects--excitation spectroscopy--interchain coupling--intrachain couplings--mean-field approximation--spin-spin correlation function--spinons--antiferromagnetic materials
Аннотация: Calculations of the thermodynamic quantities, and the spectra of spinons, triplet excitations, and two-particle spin-singlet (Delta S-z = 0, +/- 1) excitations for a weakly coupled antiferromagnetic S = 1/2 spin chain are made using a mean-field approximation for the interchain couplings (J(2)) by the quantum Monte Carlo method. The mass gaps in these excitation spectra are estimated as functions of the interchain coupling. The critical held H-c, and the temperatures at which the spinon and singlet gaps close (T-1 and T-2, respectively) are obtained. Some peculiarities of the staggered magnetization, the specific heat, and the spin-spin correlation function are found at T-1 = 0.9J(2), T-2 = 1.5J(2), H-c = 3.8J(2), as determined by linear function fitting for J(2)/J(1) 0.15 The intrachain and interchain couplings, and the staggered magnetization for KCuF3, Sr2CuO3, and Ca2CuO3 are estimated, and mass gaps are predicted to exist in the spectra of the spinons and the singlet two-particle excitations.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ignatchenko V. A., Erementchouk M. V., Maradudin A. A.
Заглавие : Correlation-induced coupling of wave fields in disordered media
Место публикации : Phys. Rev. B: AMERICAN PHYSICAL SOC, 2001. - Vol. 63, Is. 5. - Ст.54205. - ISSN 0163-1829
Примечания : Cited References: 8
Предметные рубрики: HARMONIC OSCILLATOR
CROSSING RESONANCE
Аннотация: The interaction of two wave fields of different physical natures in a disordered medium with a zero-mean coupling between these fields is studied for the example of spin and elastic waves in zero-mean magnetostrictive media. It is shown that correlations between inhomogeneities of the coupling parameter and any other parameter of the medium lead to the appearance of an effective coupling parameter between the averaged waves, which is proportional to the intensity of the correlation and, correspondingly, to the possibility of the excitation of the averaged wave of one field by a force acting on the other wave field.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pichugin K., Schanz H., Seba P.
Заглавие : Effective coupling for open billiards
Место публикации : Phys. Rev. E: AMERICAN PHYSICAL SOC, 2001. - Vol. 64, Is. 5. - Ст.56227. - ISSN 1063-651X, DOI 10.1103/PhysRevE.64.056227
Примечания : Cited References: 30
Предметные рубрики: QUANTUM CHAOTIC SCATTERING
MICROWAVE CAVITY
RESONANCE POLES
QUANTIZATION
STATISTICS
DYNAMICS
FORMULA
SYSTEMS
STATES
Аннотация: We derive an explicit expression for the coupling constants of individual eigenstates of a closed billiard that is opened by attaching a waveguide. The Wigner time delay and the resonance positions resulting from the coupling constants are compared to an exact numerical calculation. Deviations can be attributed to evanescent modes in the waveguide and to the finite number of eigenstates taken into account. The influence of the shape of the billiard and of the boundary conditions at the mouth of the waveguide are also discussed. Finally we show that the mean value of the dimensionless coupling constants tends to the critical value when the eigenstates of the billiard follow random-matrix theory.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Iskhakov R. S., Komogortsev S. V., Balaev A. D., Chekanova L. A.
Заглавие : Multilayer Co/Pd films with nanocrystalline and amorphous Co layers: Coercive force, random anisotropy, and exchange coupling of grains
Место публикации : Tech. Phys. Lett.: AMER INST PHYSICS, 2002. - Vol. 28, Is. 9. - P725-728. - ISSN 1063-7850, DOI 10.1134/1.1511766
Примечания : Cited References: 14
Предметные рубрики: MAGNETIC-PROPERTIES
SIZE DEPENDENCE
ALLOYS
FERROMAGNETS
FE
Аннотация: The values of saturation magnetization M-s, exchange coupling constant A, local magnetic anisotropy field H-a , random anisotropy correlation radius R-c, and coercive force H-c were independently measured for multilayer Co/Pd films with nanocrystalline and amorphous Co layers. It is shown that variation of the coercive force H-c(t(Co)) as a function of the cobalt layer thickness t(Co) is related to changes in characteristics of the magnetic microstructure. The main factor determining changes in the ferromagnetic correlation radius R-f and the average anisotropy [K] of a magnetic block in multilayer Co/Pd films is variation of exchange coupling constant A(t(Co)). (C) 2002 MAIK "Nauka/Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S.
Заглавие : Influence of spin-phonon coupling on the magnetic moment in 2D spin-1/2 antiferromagnet
Место публикации : Phys. Lett. A. - 2003. - Vol. 313, Is. 1-2. - P.122-125. - ISSN 0375-9601, DOI 10.1016/S0375-9601(03)00689-3
Примечания : Cited References: 17
Предметные рубрики: SQUARE LATTICE
EU2CUO4
MODEL
Ключевые слова (''Своб.индексиров.''): 2d heisenberg model--spin-phonon interactions--2d heisenberg model--spin-phonon interactions--ferromagnetic material--anisotropy--article--liquid--magnetism--mathematical model--monte carlo method--quantum theory--thermal conductivity--vibration
Аннотация: The ground state of two-dimensional Heisenberg spin-1/2 antiferromagnet (AF) with the spin-phonon coupling is studied by the quantum Monte Carlo method. The magnetic moment per site, mean-square vibration of ion, phase diagram of AF long range order-quantum spin. liquid are simulated. The spin-phonon coupling is estimated for R2CuO4, R = Gd, Eu. (C) 2003 Elsevier Science B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Patrin G. S., Vas'kovskii V. O., Svalov A. V., Eremin E. V., Panova M. A., Vasil'ev V. N.
Заглавие : Magnetic resonance in multilayer Gd/Si/Co magnetic films
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2006. - Vol. 102, Is. 1. - P131-136. - ISSN 1063-7761, DOI 10.1134/S1063776106010158
Примечания : Cited References: 9
Предметные рубрики: FIELD
Ключевые слова (''Своб.индексиров.''): magnetic properties--molecular dynamics--paramagnetic resonance--thin films--exchange parameters--gyromagnetic ratios--interlayer coupling--magnetic dynamics--resonance
Аннотация: The magnetic properties of multilayer Gd/Si/Co magnetic films are experimentally studied by electron magnetic resonance and analyzed theoretically. The introduction of a semiconductor silicon interlayer is found to substantially affect the magnetic interlayer coupling and the magnetic dynamics of the system. The interlayer coupling is shown to be ferromagnetic for the (Gd/Si)(n) films and to be antiferromagnetic for the (Gd/Si/Co/Si)(n) films. The temperature dependences of the exchange parameters and the gyromagnetic ratios are determined. Possible mechanisms responsible for the formation of the interlayer coupling are discussed.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Popkov S. I., Shaikhutdinov K. A., Petrov M. I.
Заглавие : Investigation of the Josephson coupling through a magnetoactive barrier (ferrimagnet, paramagnet) in Y3/4Lu1/4Ba2Cu3O7+Y-3(Al1-xFex)(5)O-12 composites
Разночтения заглавия :авие SCOPUS: Investigation of the Josephson coupling through a magnetoactive barrier (ferrimagnet, paramagnet) in Y3/4Lu1/4Ba 2Cu3O7 + Y3(Al1 - X Fe x )5O12 composites
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2006. - Vol. 48, Is. 11. - P2046-2055. - ISSN 1063-7834, DOI 10.1134/S1063783406110023
Примечания : Cited References: 41
Предметные рубрики: S-F-S
MAGNETIC-PROPERTIES
RESISTIVE PROPERTIES
JUNCTION NETWORK
SUPERCONDUCTOR
Y3FE5-XALXO12
TRANSITION
TRANSPORT
METAL
FIELD
Аннотация: The transport properties of two-phase composites consisting of a high-temperature superconductor and a nonsuperconducting component with magnetic ordering are analyzed. These composites are considered as a network of "superconductor-magnetoactive insulator-superconductor" weak links of the Josephson type. Substituted garnets Y-3(Al1 - x Fe (x) )(5)O-12 (x = 0, ..., 1.0) are used as a magnetoactive component. The composites under investigation contain 92.5 vol % Y3/4Lu1/4Ba2Cu3O7 (the high-temperature superconductor) and 7.5 vol % Y-3(Al1 - x Fe (x) )(5)O-12 (x = 0, ..., 1.0). It is shown that an increase in the iron content in the Y-3(Al1 - x Fe (x) )(5)O-12 garnet leads to a reduction of the Josephson coupling strength: the temperature range in which the electrical resistance of the composites is equal to zero is reduced, and the critical current density at a temperature of 4.2 K decreases exponentially. For composites in which the iron content in the Y-3(Al1 - x Fe (x) )(5)O-12 garnet is higher than 0.1, the temperature dependence of the electrical resistance R(T) at temperatures below the transition point T-C of high-temperature superconductor crystallites has a portion in the range T-m -T-C where the resistance R(T) is independent of the transport current and the magnetic field strength. Below the temperature T-m , the dependences of the electrical resistance R(T) of the composites are nonlinear functions of the current and involve a considerable contribution from magnetoresistance. This behavior is characteristic of a network of Josephson junctions. The temperature T-m decreases with an increase in the iron content in the Y-3(Al1 - x Fe (x) )(5)O-12 garnet. The appearance of the above feature in the temperature dependences of the electrical resistance R(T) is interpreted as complete suppression of the Josephson coupling in the temperature range above T (m) due to the interaction of supercurrent carrier pairs with magnetic moments of iron atoms in the dielectric barriers separating high-temperature superconductor grains.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Rotter I., Sadreev A. F.
Заглавие : Correlated behavior of conductance and phase rigidity in the transition from the weak-coupling to the strong-coupling regime
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2007. - Vol. 76, Is. 21. - Ст.214302. - ISSN 1098-0121, DOI 10.1103/PhysRevB.76.214302
Примечания : Cited References: 42
Предметные рубрики: OPEN QUANTUM-SYSTEMS
NUCLEAR CROSS-SECTIONS
UNIFIED THEORY
FLUCTUATIONS
CONTINUUM
BILLIARD
STATES
Аннотация: We study the transmission through different small systems as a function of the coupling strength v to the two attached leads. The leads are identical with only one propagating mode xi(E)(C) in each of them. In addition to the conductance G, we calculate the phase rigidity rho of the scattering wave function Psi(E)(C) in the interior of the system. Most interesting results are obtained in the regime of strongly overlapping resonance states where the crossover from staying to traveling modes takes place. The crossover is characterized by collective effects. Here, the conductance is plateaulike enhanced in some energy regions of finite length while corridors with zero transmission (total reflection) appear in other energy regions. This transmission picture depends only weakly on the spectrum of the closed system. It is caused by the alignment of some resonance states of the system with the propagating modes xi(E)(C) in the leads. The alignment of resonance states takes place stepwise by resonance trapping, i.e., it is accompanied by the decoupling of other resonance states from the continuum of propagating modes. This process is quantitatively described by the phase rigidity rho of the scattering wave function. Averaged over energy in the considered energy window, G is correlated with 1-rho . In the regime of strong coupling, only two short-lived resonance states survive each aligned with one of the channel wave functions xi(E)(C). They may be identified with traveling modes through the system. The remaining M-2 trapped narrow resonance states are well separated from one another.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Song Y. Y., Kim D. H., Yu S. C., Kim P. D., Turpanov I. A., Lee L. A., Buzmakov A. E., Lee K. W.
Заглавие : Observation of nonmonotonic oscillatory interlayer exchange coupling in Co/Cu/CoO films with varying Cu spacer thickness
Разночтения заглавия :авие SCOPUS: Observation of nonmonotonic oscillatory interlayer exchange coupling in CoCuCoO films with varying Cu spacer thickness
Место публикации : J. Appl. Phys.: AMER INST PHYSICS, 2008. - Vol. 103: 52nd Annual Conference on Magnetism and Magnetic Materials (NOV 05-09, 2007, Tampa, FL), Is. 7. - Ст.07C112. - ISSN 0021-8979, DOI 10.1063/1.2831390
Примечания : Cited References: 20
Предметные рубрики: GIANT MAGNETORESISTANCE
MAGNETIC-ANISOTROPY
LAYERS
BIAS
SUPERLATTICES
MULTILAYERS
TRILAYERS
Ключевые слова (''Своб.индексиров.''): copper--film thickness--thermal effects--cocucoo films--oscillatory interlayer exchange coupling.--metallic films
Аннотация: We report our experimental observation of interlayer exchange coupling phenomena in CoO/Cu/Co trilayers with systematic variation of Cu spacer layer thickness as well as temperature. It has been found that there exists a clear indication of nonmonotonically varying oscillatory interlayer exchange coupling. The amplitude of oscillation increases, reaches to the maximum, and decreases with increasing Cu spacer thickness from 1 to 16 atomic layers for all temperature ranges between 70 and 200 K. (c) 2008 American Institute of Physics.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aver'yanov E. M.
Заглавие : Nonlinear coupling between the mean polarizability (gamma)over-bar of molecules and the local-field anisotropy in a liquid crystal and change of the "(gamma)over-bar = const" paradigm
Разночтения заглавия :авие SCOPUS: Nonlinear coupling between the mean polarizability gamma ̄ of molecules and the local-field anisotropy in a liquid crystal and change of the "gammā = const" paradigm; авие SCOPUS: Nonlinear coupling between the mean polarizability gamma ? of molecules and the local-field anisotropy in a liquid crystal and change of the "gamma = const" paradigm
Место публикации : JETP Letters. - 2008. - Vol. 87, Is. 5. - P.258-261. - ISSN 0021-3640, DOI 10.1134/S002136400805007X; \b JETP Letters. - 2008. - Vol. 87, Is. 5. - P.258-261. - Вариант Sopus
Примечания : Cited References: 14
Предметные рубрики: REFRACTIVE-INDEXES
ORDER
Аннотация: The nonlinear relation between the mean effective polarizability (gamma) over bar of molecules and the local-field anisotropy in uniaxial liquid crystals is demonstrated. Stringent constraints on (gamma) over bar from below, indicative of the dependence of on the liquid-crystal state and the change of the "(gamma) over bar = const" paradigm, are established. The theoretical results are confirmed by experiments with nematic liquid crystals having high and low birefringences.
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14.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Patrin G. S., Turpanov I. A., Petrakovskaya E. A., Rautsky M. V., Patrin K. G., Kobyakov A. V.
Заглавие : Magnetic resonance investigations of interlayer coupling in Co/Ge/Co trilayer films
Коллективы : Российская академия наук, Физико-технический институт им. А.Ф. Иоффе РАН, "Spin Waves", International Symposium
Место публикации : International Symposium "Spin waves - 2009": Saint Petersburg, Russia, June 7-12, 2009 : Simposium program. Abstracts. - 2009. - С. 63
Примечания : The present investigations have financial support of Russian Fund of Basic Research (grant №08-02-00397-а).
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15.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Shneyder E., Ovchinnikov S.
Заглавие : BCS-type Theory for the Sum of Magnetic and Phonon Coupling in high-Tc Cuprates
Коллективы : International Conference on Magnetism
Место публикации : 18th International Conference on Magnetism (ICM-2009). - 2009. - Ст.Mo-A-5.1-03
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16.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Val'kov V. V., Val'kova T. A., Shklyaev A. A.
Заглавие : On instability of the neel phase of the anisotropic non-heisenberg hamiltonian with antiferromagnetic coupling on a square lattice
Коллективы : Российская академия наук, Физико-технический институт им. А.Ф. Иоффе РАН, "Spin Waves", International Symposium
Место публикации : International Symposium "Spin waves - 2009": Saint Petersburg, Russia, June 7-12, 2009 : Simposium program. Abstracts. - 2009. - С. 38
Примечания : This study was supported by the Program “Quantum Physics of Condensed Matter” of the Presidium of the Russian Academy of Sciences, the Russian Foundation for Basic Research (project no. 07-02-00226), and the Siberian Branch of the Russian Academy of Sciences (integration project no.53).
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rasch JCE, Boehm M., Ritter C., Mutka H., Schefer J., Keller L., Abramova G. M., Cervellino A., Loffler J. F.
Заглавие : Magnetoelastic coupling in the triangular lattice antiferromagnet CuCrS2
Коллективы : Russian Academy of Science (RAS), Siberian Branch [06-1000013-9002]
Место публикации : Phys. Rev. B. - 2009. - Vol. 80, Is. 10. - Ст.104431. - ISSN 1098-0121, DOI 10.1103/PhysRevB.80.104431
Примечания : Cited References: 30. - We are grateful for support and allocated beam time at the Institut Laue-Langevin (D1A, IN3),Grenoble, France, the spallation neutron source SINQ (TriCS, DMC) and the SLS-MS beamline, both Paul Scherrer Insitut, Villigen, Switzerland. This work was supported by INTAS Grant No. 06-1000013-9002 of the Russian Academy of Science (RAS), Siberian Branch.
Предметные рубрики: NEUTRON POWDER DIFFRACTION
MAGNETIC-STRUCTURE
STRUCTURAL-PROPERTIES
PHASE-TRANSITION
SOLID OXYGEN
ALPHA-PHASES
BETA-PHASES
SELENIDES
SULFIDES
Аннотация: CuCrS2 is a triangular lattice Heisenberg antiferromagnet with a rhombohedral crystal structure. We report on neutron and synchrotron powder diffraction results which reveal a monoclinic lattice distortion at the magnetic transition and verify a magnetoelastic coupling. CuCrS2 is therefore an interesting material to study the influence of magnetism on the relief of geometrical frustration.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rasch J.C.E., Boehm M., Ritter C., Mutka H., Schefer J., Keller L., Abramova G. M., Cervellino A., Leoffler J.F.
Заглавие : Magnetoelastic coupling in triangular lattice antiferromagnet CuCrS2
Место публикации : arXiv. - 2009. - Ст.cond-mat/0907.4850. - С. 1-6
Примечания : Библиогр.: 30
Аннотация: CuCrS2 is a triangular lattice Heisenberg antiferromagnet with a rhombohedral crystal structure. We report on neutron and synchrotron powder diffraction results which reveal a monoclinic lattice distortion at the magnetic transition and verify a magnetoelastic coupling. CuCrS2 is therefore an interesting material to study the influence of magnetism on the relief of geometrical frustration.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tyurnev V. V.
Заглавие : Coupling coefficients of resonators in microwave filter theory
Место публикации : Progress In Electromagnetics Research B. - 2010. - № 21. - P.47-67. - ISSN 1937-6472
РИНЦ
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Frolov G. I., Seredkin V. A., Yakovchuk V. Y.
Заглавие : Studying the mechanism of exchange coupling in ferro/ferrimagnet NiFe/DyCo film structures
Коллективы :
Место публикации : Tech. Phys. Lett.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2010. - Vol. 36, Is. 1. - P57-59. - ISSN 1063-7850, DOI 10.1134/S1063785010010189
Примечания : Cited References: 7. - This study was supported in part by the Program for Development of the Scientific Potential of Russian Universities (project no. RNP.2.1.1/4399).
Предметные рубрики: ANISOTROPY
Аннотация: Dependence of the magnetic and magnetooptical properties of an exchange-coupled NiFe/DyCo bilayer system on the thickness (t (DyCo)) of a magnetically hard layer has been studied. It is established that the unidirectional anisotropy vanishes at t (DyCo) similar to 400 , while the coercive field in the magnetically soft layer becomes comparable to the exchange-induced field shift. In this case, the DyCo layer magnetization is almost parallel to the film plane, whereas a reference DyCo film exhibits a perpendicular anisotropy. A model of the magnetic state of layers in the ferro/ferrimagnetic layer structure under consideration is proposed, which assumes that a 180A degrees domain wall is formed at the interface upon magnetization reversal in the magnetically soft layer.
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