## 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 (E_{F}) between dγ and dε orbitals. The fourfold symmetric term is proportional to the difference of partial DOS at E_{F} among dε orbitals. In addition, using the expressions, we analyze an experimental result of the AMR ratio of Fe_{4}N.

Original language | English |
---|---|

Pages (from-to) | 1026-1032 |

Number of pages | 7 |

Journal | Physica Status Solidi (C) Current Topics in Solid State Physics |

Volume | 11 |

Issue number | 5-6 |

DOIs | |

Publication status | Published - 2014 May |

## Keywords

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

## ASJC Scopus subject areas

- Condensed Matter Physics