Twofold and fourfold symmetric anisotropic magnetoresistance effect in a model with crystal field

Satoshi Kokado, Masakiyo Tsunoda

研究成果: Article査読

17 被引用数 (Scopus)

抄録

We theoretically study the twofold and fourfold symmetric anisotropic magnetoresistance (AMR) effects of ferromagnets. We here use the two-current model for a system consisting of a conduction state and localized d states. The localized d states are obtained from a Hamiltonian with a spin-orbit interaction, an exchange field, and a crystal field. From the model, we first derive general expressions for the coefficient of the twofold symmetric term (C2) and that of the fourfold symmetric term (C4) in the AMR ratio. In the case of a strong ferromagnet, the dominant term in C2 is proportional to the difference in the partial densities of states (PDOSs) at the Fermi energy (EF) between the de and dγ states, and that in C4 is proportional to the difference in the PDOSs at EF among the de states. Using the dominant terms, we next analyze the experimental results for Fe4N, in which |C2| and |C4| increase with decreasing temperature. The experimental results can be reproduced by assuming that the tetragonal distortion increases with decreasing temperature.

本文言語English
論文番号094710
ジャーナルjournal of the physical society of japan
84
9
DOI
出版ステータスPublished - 2015 9 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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