Relationship between magnetocrystalline anisotropy and orbital magnetic moment in L1 0-type ordered and disordered alloys

Yohei Kota, Akimasa Sakuma

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

The magnetocrystalline anisotropy energy and orbital magnetic moment in L1 0-type transition metal alloys such as FePt, FePd, FeNi, CoPt, CoPd, and MnAl are evaluated while continuously varying the degree of order. The electronic structure with spin-orbit interaction is calculated by employing the tight-binding linear muffin-tin orbital method based on the local spin-density approximation. To control the degree of order, we consider a substitutional disorder and then adopt the coherent potential approximation. The magnetocrystalline anisotropy energy δE is roughly proportional to the power of the long-range order parameter S, i.e., δE α S n (n ̃ 1.6-2.4). We also discuss the relationship between the magnetocrystalline anisotropy energy and the orbital magnetic moment. In the same compositional system with different degrees of order, the difference between the orbital magnetic moment in the magnetic easy axis and that in the hard one is proportional to δE. However, the coefficient corresponding to the effective spin-orbit coupling is inconsistent with the intrinsic one in some cases.

Original languageEnglish
Article number084705
Journaljournal of the physical society of japan
Volume81
Issue number8
DOIs
Publication statusPublished - 2012 Aug 1

Keywords

  • Coherent potential approximation
  • First-principles calculation
  • L1 -type alloys
  • Magnetocrystalline anisotropy
  • Orbital magnetic moment
  • Spin-orbit interaction

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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