Spin polarization ratios of resistivity and density of states estimated from anisotropic magnetoresistance ratio for nearly half-metallic ferromagnets

Abstract

We derive a simple relational expression between the spin polarization ratio of resistivity, $P_{\rho }$, and the anisotropic magnetoresistance ratio $\Delta \rho /\rho$, and that between the spin polarization ratio of the density of states at the Fermi energy, $P_{\mathrm{DOS}}$, and $\Delta \rho /\rho$ for nearly half-metallic ferromagnets. We find that $P_{\rho }$ and $P_{\mathrm{DOS}}$ increase with increasing $|\Delta \rho /\rho |$ from 0 to a maximum value. In addition, we roughly estimate $P_{\rho }$ and $P_{\mathrm{DOS}}$ for a Co${}_2$FeGa${}_{0.5}$Ge${}_{0.5}$ Heusler alloy by substituting its experimentally observed $\Delta \rho /\rho$ into the respective expressions.

arXiv comment10 pages, 3 figures, 2 tables, to be published in Jpn. J. Appl. Phys

References in corpus (4)

• Anisotropic Magnetoresistance Effects in Fe, Co, Ni, Fe_4N, and Half-Metallic Ferromagnet: A Systematic Analysis
• Twofold and Fourfold Symmetric Anisotropic Magnetoresistance Effect in A Model with Crystal Field
• Anisotropic Magnetoresistance Effect: General Expression of AMR Ratio and Intuitive Explanation for Sign of AMR Ratio
• Investigation of thermoelectric properties of half-metallic Co2 MnGe by using first principles calculations

Cited by in corpus (3)

• Theoretical Study on Anisotropic Magnetoresistance Effects of I//[100], I//[110], and I//[001] for Ferromagnets with A Crystal Field of Tetragonal Symmetry
• Unravelling the interplay of geometrical, magnetic and electronic properties of metal-doped graphene nanomeshes
• Theoretical Study on Anisotropic Magnetoresistance Effects of Arbitrary Directions of Current and Magnetization for Ferromagnets: Application to Transverse Anisotropic Magnetoresistance Effect