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  • 1
    Electronic Resource
    Electronic Resource
    Quantum fluctuations in the vicinity of the spin–flop transition in large-spin clusters (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4530-4532 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: If a single-spin possessing an easy-axis anisotropy is subjected to an external field perpendicular to the easy axis, the susceptibility exhibits a peculiar peak. We establish that the specific spectral properties of quantum fluctuations give rise to this peak. We predict that this effect takes place in real many-spin systems, such as Mn12 clusters, and can be studied at finite temperatures in real experiments with attainable resolution. For studying quantum fluctuations in magnetic molecules, this offers an approach as an alternative to relaxation rate measurements. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370398
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  • 2
    Electronic Resource
    Electronic Resource
    New intensity magneto-optical effect in materials exhibiting giant magnetoresistance (1998)
    Springer
    Journal of experimental and theoretical physics 87 (1998), S. 600-607 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The change in the reflectivity of a metallic magnetic multilayer that exhibits giant magnetoresistance for a monochromatic electromagnetic plane wave with polarization along the magnetization (s polarization) in response to a change from the antiferromagnetic magnetic configuration of the multilayer to the ferromagnetic configuration is investigated. This magneto-optical effect is treated in the effective-medium approximation, in which the dielectric constant needed is found analytically with consideration of the interface roughness scattering of electrons. It is shown in the example of an Fe/Cu multilayer that the effect amounts to ∼0.7%. The representation found for the complex conductivity is convenient in a special case for investigating the magnetoresistive effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558699
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  • 3
    Electronic Resource
    Electronic Resource
    Nonlinear magneto-optical Kerr effects (1999)
    Springer
    Journal of experimental and theoretical physics 89 (1999), S. 77-85 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The polarization state of a second-harmonic wave after reflection from a semi-infinite, optically isotropic magnetic medium is considered for the three characteristic uniformmagnetization directions corresponding to the linear magneto-optical Kerr effects. Expressions for the complex amplitudes of the wave field which specify the nonlinear Kerr effects, viz., the polar, meridional, and equatorial effects, are obtained in a first approximation with respect to the magnetization. The dependences of these effects on the angle of incidence of the inducing wave obtained as a result of a numerical experiment are presented. Analytical formulas are found for them at small angles of incidence. A comparative analysis of the linear and nonlinear Kerr effects is made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558957
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  • 4
    Electronic Resource
    Electronic Resource
    Faraday effect of europium organic glass in megagauss magnetic fields (2000)
    Springer
    Physics of the solid state 42 (2000), S. 726-729 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Faraday rotation of europium organic glass (based on polymethyl methacrylate) in megagauss fields is investigated experimentally and theoretically. The experiment was performed using an MK-1 magnetic explosion generator and laser radiation at the wavelength λ=0.85 µm at T=30 K. It is found that the dependence of the rotation angle of the polarization plane on the magnetic field is nonlinear. The theoretical results are compared with the experimental data. The contribution of the orbital angular momentum of europium ions to the Faraday effect is revealed. The conclusion is drawn that the previously found anomalies of the Faraday effect for the laser radiation at the wavelength λ=0.63 µm are brought about by the magnetooptical resonance, which is induced by the ultrastrong field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1131280
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetoelectric effect and toroidal ordering in Ga2−x FexO3 (1998)
    Springer
    Journal of experimental and theoretical physics 87 (1998), S. 146-151 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The field dependence of the magnetoelectric effect and longitudinal magnetostriction of Ga2−x FexO3 single crystals is studied in magnetic fields up to 200 kOe in the temperature range from 4.2 to 300 K. It is shown that the magnetoelectric effect in these materials is determined mainly by the toroidal moment T and is not related to magnetostriction, as was previously theorized. A new method for determining the toroidal moment by measuring the electric polarization in a strong magnetic field is proposed. The value of the toroidal moment of the unit cell in Ga1.15Fe0.85O3 is calculated: T=(T a ,0,0), where T a =24.155µ B Å per unit cell. Experimental data are analyzed using a theory of toroidal spin ordering, which gives good agreement with experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558635
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  • 6
    Electronic Resource
    Electronic Resource
    Phase transitions in anisotropic magnetic superlattices (1997)
    Springer
    Physics of the solid state 39 (1997), S. 155-157 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The paper reports a theoretical study of phase transitions in antiferromagnetic superlattices. The boundaries of stability of the ferro-and antiferromagnetic phases have been calculated by a model taking into account the layered structure of these materials. The expressions obtained are precise in the limit of a large number of layers. In the case of a small number of layers, the problem reduces to a simple numerical procedure of solving a transcendental equation. The critical field is shown to depend substantially on the biquadratic non-Heisenberg exchange constant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1129819
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  • 7
    Electronic Resource
    Electronic Resource
    Field-induced spin-reorientation transitions in magnetic superlattices with uniaxial anisotropy and biquadratic exchange (1999)
    Springer
    Physics of the solid state 41 (1999), S. 413-415 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Phase transitions induced by an external field are investigated in magnetic multilayer systems with uniaxial anisotropy and biquadratic exchange. A magnetic field directed perpendicular to the plane of the layers changes the effective anisotropy and exchange constants, determining the orientation of the magnetization in the plane of the layers, and can give rise to spin-reorientation transitions. All possible types of such transitions are investigated for the case of uniaxial anisotropy, which differs substantially from the case of cubic anisotropy by the different renormalization of the effective anisotropy constants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130793
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  • 8
    Electronic Resource
    Electronic Resource
    New nonlinear intensity Kerr effect in the polar geometry (2000)
    Springer
    Physics of the solid state 42 (2000), S. 1873-1880 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The problem of the electromagnetic wave reflection on the second optical harmonic from a semi-infinite optically isotropic magnetic medium is considered for the uniform magnetization direction corresponding to the polar Kerr effect. In the first approximation in magnetization, the method of Green’s tensor functions is used to derive expressions for the complex amplitudes of the wave fields for the incidence of s-and p-polarized waves (as well as of their superposition) on the medium. It is shown that, in the latter case, the nonlinear polar Kerr effect is of the intensity type. The dependences of the intensity effect on the angle of incidence of the inducing wave and on the angle of its polarization, which were obtained in numerical experiments, are presented. A comparative analysis of the linear and nonlinear intensity Kerr effects is carried out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1318880
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  • 9
    Electronic Resource
    Electronic Resource
    Investigation of metamagnetic transitions in the itinerant d subsystem of the intermetallics RCo2 in superstrong magnetic fields up to 300 T (1996)
    Springer
    JETP letters 64 (1996), S. 202-206 
    Details
    ISSN: 1090-6487
    Keywords: 75.60.Ej
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The time derivatives of the magnetization of intermetallic compounds RCo2 (R = Y, Tm, Er, Ho, or Dy) with a metamagnetic subsystem of itinerant d electrons have been measured in pulsed magnetic fields up to 300 T generated by an explosive method. Peaks associated with abrupt demagnetization or magnetization of the d subsystem are found in the field dependences of dM/dH. The results obtained are compared with theoretical estimates and the values derived for the critical fields from measurements performed on substituted compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567175
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  • 10
    Electronic Resource
    Electronic Resource
    57Fe NMR study of a spatially modulated magnetic structure in BiFeO3 (2000)
    Springer
    JETP letters 71 (2000), S. 465-468 
    Details
    ISSN: 1090-6487
    Keywords: 76.60.Lz ; 75.25.+z.466
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The 57 Fe spin echo spectra were studied in local magnetic fields of a BiFeO3 ferroelectric antiferromagnet over the temperature range 77–304 K. The line shape analysis confirmed the presence of a spatially modulated, incommensurate cycloidal spin structure in BiFeO3 and allowed the actual spin distribution to be reproduced throughout the cycloid length. The distribution was found to be essentially anharmonic. The modulated structure is stable over the whole temperature range studied. The cycloid wave becomes more harmonic with temperature elevation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1307994
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