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Surface Effects in Amorphous Ferromagnets with Random Anisotropy

  • R. Micnas
  • A. R. Ferchmin
  • S. Krompiewski
  • B. Szczepaniak

Abstract

Considerable attention is being given at present to the surface problem of magnetics. In this paper we would like to discuss how surfaces influence the properties of amorphous magnetics [1,2]. To this aim, we have selected, from the various available models of amorphous magnetics [1,2,3,4], two interrelated models [3,4] stressing the role of random local magnetic anisotropy in these materials. Accordingly, we adopt a Hamiltonian consisting of an exchange term and an anisotropic term:
$$ {\text{H}}\;{\text{ = - }}\sum\limits_{\text{i}} {{{\text{V}}_{\text{i}}}\; - } \;\sum\limits_{\text{i}} {} \sum\limits_{\text{j}} {} \;{{\text{K}}_{\text{i}}}_{\text{j}}{{\text{J}}_{\text{i}}}{{\text{J}}_{\text{j}}} $$
(1)
Specifically, the direction of the anisotropy varies randomly in the Harris-Plischke-Zuchermann (HPZ) model [3]. In the related model [4] proposed by Taggart, Tahir-Kheli and Shiles (TTS), it is the value of the anisotropy Di which is subject to random variation.

Keywords

Curie Temperature Free Boundary Surface Magnetism Local Anisotropy Anisotropic Term 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

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Copyright information

© Plenum Press, New York 1977

Authors and Affiliations

  • R. Micnas
    • 1
  • A. R. Ferchmin
    • 2
  • S. Krompiewski
    • 2
  • B. Szczepaniak
    • 1
  1. 1.Institute of PhysicsA. Mickiewicz UniversityPoznanPoland
  2. 2.Institute of Molecular Physics, Ferromagnetics LaboratoryPolish Academy of SciencesPoznanPoland

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