TY - JOUR

T1 - Anisotropic magnetoresistance effect of a strong ferromagnet

T2 - Magnetization direction dependence in a model with crystal field

AU - Kokado, Satoshi

AU - Tsunoda, Masakiyo

N1 - Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2014/5

Y1 - 2014/5

N2 - 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.

AB - 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.

KW - Crystal field

KW - Perturbation theory

KW - Resistivity

KW - Spin-orbit interaction

KW - s -d scattering

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U2 - 10.1002/pssc.201300736

DO - 10.1002/pssc.201300736

M3 - Article

AN - SCOPUS:84900803119

VL - 11

SP - 1026

EP - 1032

JO - Physica Status Solidi C: Conferences

JF - Physica Status Solidi C: Conferences

SN - 1862-6351

IS - 5-6

ER -