1305.3517 (Satoshi Kokado et al.)

Anisotropic Magnetoresistance Effect: General Expression of AMR Ratio
and Intuitive Explanation for Sign of AMR Ratio    [PDF]

Satoshi Kokado, Masakiyo Tsunoda

We derive the general expression of the anisotropic magnetoresistance (AMR) ratio of ferromagnets for a relative angle between the magnetization direction and the current direction. We here use the two-current model for a system consisting of a spin-polarized conduction state (s) and localized d states (d) with spin-orbit interaction. Using the expression, we analyze the AMR ratios of Ni and a half-metallic ferromagnet. These results correspond well to the respective experimental results. In addition, we give an intuitive explanation about a relation between the sign of the AMR ratio and the s-d scattering process.

View original: http://arxiv.org/abs/1305.3517