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  • 75.30.Kz  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Critical behavior of the surface of FeBO3 single crystals (2000)
    Springer
    JETP letters 71 (2000), S. 442-445 
    Details
    ISSN: 1090-6487
    Keywords: 75.30.Kz ; 75.40.−s ; 68.35.Rh
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The behavior of the surface and near-surface layers of macroscopic FeBO3 single crystals is studied over the temperature range from 291 K to Neél temperature (T N ) using depth-selective conversion-electron Mössbauer spectroscopy. Three different phases or states, namely, an antiferromagnetically ordered phase (similar to the crystal bulk state), a surface phase, and a transition layer between them coexist near the Neél point in a surface layer ∼500 nm thick. The critical parameters found for the bulk phase agree well with the theoretical critical index νth≅0.63 predicted by the 3D Ising model. As the crystal surface is approached, the critical parameter β increases to 0.51(2) but remains smaller than the value of β=0.8 for the surface of a semi-infinite Heisenberg model. Therefore, the effective dimensionality of the system, being equal to 3 in the bulk, decreases at the crystal surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568373
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic states of the surface and bulk of ferrites near a phase transition at the Curie temperature (1999)
    Springer
    JETP letters 69 (1999), S. 57-63 
    Details
    ISSN: 1090-6487
    Keywords: 75.50.Bb ; 75.30.Kz ; 75.40.−s
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Investigations of the magnetic state of a surface layer ~200 nm thick and of the bulk in macroscopic ferrite crystals of the type Ba-M (BaFe12O19) are performed in the phase transition region around the Curie temperature (T c). The method of simultaneous gamma, x-ray, and electron Mössbauer spectroscopy, which made it possible to compare directly the phase states of the surface and bulk of the sample, is used for the measurements. It is observed experimentally that in BaFe12O19 the transition of a surface layer ~200 nm thick to the paramagnetic state occurs at temperatures below T c. It is established that the transition temperature T c(L) of a thin layer localized at depth L from the surface of the crystal increases with distance from the surface and reaches the value T c at the lower boundary of the “critical” surface layer. Therefore, near T c a nonuniform state in which the crystal is magnetically ordered in the bulk but disordered at the surface is observed. A phase diagram of the states of the surface and of the bulk of macroscopic magnets near the Curie (or Néel) point is proposed on the basis of all the experimental results obtained in the present work as well as previously published results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567984
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    Paper (German National Licenses)
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