Anisotropic magnetoresistance effect of a strong ferromagnet: Magnetization direction dependence in a model with crystal field

Satoshi Kokado, Masakiyo Tsunoda

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

We theoretically study magnetization direction dependence of the anisotropic magnetoresistance (AMR) effect of a strong ferromagnet. We here use the two-current model which takes into account the s -d scattering, where s (d) is the conduction state (the localized d states). The d states have the spin-orbit interaction, exchange field, and crystal field of tetragonal symmetry. From the model, we derive analytic expressions of twofold and fourfold symmetric terms of the AMR ratio. The dominant component in the twofold symmetric term is proportional to the difference of partial density-of-states (DOS) at the Fermi energy (EF) between dγ and dε orbitals. The fourfold symmetric term is proportional to the difference of partial DOS at EF among dε orbitals. In addition, using the expressions, we analyze an experimental result of the AMR ratio of Fe4N.

Original languageEnglish
Pages (from-to)1026-1032
Number of pages7
JournalPhysica Status Solidi (C) Current Topics in Solid State Physics
Volume11
Issue number5-6
DOIs
Publication statusPublished - 2014 May

Keywords

  • Crystal field
  • Perturbation theory
  • Resistivity
  • Spin-orbit interaction
  • s -d scattering

ASJC Scopus subject areas

  • Condensed Matter Physics

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