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Publication Citation: Enhanced magnetization drift velocity and current polarization in (CoFe)_{1-x}Ge_{x} alloys

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Author(s): Meng Zhu; Brian D. Soe; Robert D. McMichael; Matthew Carey; Stefan Maat; Jeffrey R. Childress;
Title: Enhanced magnetization drift velocity and current polarization in (CoFe)_{1-x}Ge_{x} alloys
Published: February 17, 2011
Abstract: A spin wave Doppler technique is used to measure the drift velocity of the magnetization in current-carrying (CoFe)_{1-x}Ge_{x} alloys. For a current density of 10^11 A/m2, we obtain a large enhancement of drift velocity from 3.1+/-0.2 m/s for CoFe to 8.2+/-0.6 m/s for (CoFe)_{0.7}Ge_{0.3}. Interpretation of these values yields current polarization increasing from 0.84+/-0.04 to 0.95+/-0.05 as the Ge doping increases. The spin dependent conductivities indicate a stronger percentage change in minority spin conductivity, which agrees with the prediction of a pseudogap in the minority band for (CoFe)_{0.75}Ge_{0.25}.
Citation: Applied Physics Letters
Volume: 98
Issue: 7
Pages: 3 pp.
Keywords: Spin wave Doppler; CoFeGe alloys; current spin polarization
Research Areas: Physics, Magnetic materials, Electron Physics
PDF version: PDF Document Click here to retrieve PDF version of paper (506KB)