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.

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

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