Satoshi Kokado, Masakiyo Tsunoda, Kikuo Harigaya, Akimasa Sakuma. Anisotropic Magnetoresistance Effects in Fe, Co, Ni, Fe_4n, and Half-metallic Ferromagnet: A Systematic Analysis


Natural Sciences / Physics / Condensed Matter Physics

Submitted on: Sep 16, 2012, 16:10:31

Description: We theoretically analyze the anisotropic magnetoresistance (AMR) effects of bcc Fe (+), fcc Co (+), fcc Ni (+), Fe$_4$N (-), and a half-metallic ferromagnet (-). The sign in each ( ) represents the sign of the AMR ratio observed experimentally. We here use the two-current model for a system consisting of a spin-polarized conduction state and localized d states with spin--orbit interaction. From the model, we first derive a general expression of the AMR ratio. The expression consists of a resistivity of the conduction state of the $sigma$ spin ($sigma=uparrow$ or $downarrow$), $rho_{s sigma}$, and resistivities due to s--d scattering processes from the conduction state to the localized d states. On the basis of this expression, we next find a relation between the sign of the AMR ratio and the s--d scattering process. In addition, we obtain expressions of the AMR ratios appropriate to the respective materials.

The abstract of this article will be published in the September 2012 issue of "Intellectual Archive Bulletin", ISSN 1929-1329.

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