We derive an expression of the anisotropic magnetoresistance (AMR) ratio for weak ferromagnets with a crystal field of tetragonal symmetry using the electron scattering theory. This theory is based on the twocurrent model consisting of a conduction state and localized d states with a spin-orbit interaction and the crystal field. The expression of the AMR ratio is related to the partial density of states of each orbital at the Fermi energy. On the basis of this expression, we investigate the sign of the AMR ratio. In addition, we analyze the experimental result of the negative AMR ratio at low temperature for a typical weak ferromagnet, bcc Fe.
|ジャーナル||Materials Today: Proceedings|
|出版ステータス||Published - 2020|
|イベント||10th International Conference on Key Engineering Materials, ICKEM 2020 - Madrid, Spain|
継続期間: 2020 3 26 → 2020 3 29
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