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Enhanced magnetization drift velocity and current polarization in (CoFe)1−xGex alloys

Authors :
Robert D. McMichael
Matthew J. Carey
Brian D. Soe
Stefan Maat
Jeffrey R. Childress
Meng Zhu
Source :
Applied Physics Letters. 98:072510
Publication Year :
2011
Publisher :
AIP Publishing, 2011.

Abstract

A spin-wave Doppler technique is used to measure the drift velocity of the magnetization in current-carrying (CoFe)1−xGex alloys. For a current density of 1011 A/m2, we obtain a large enhancement of drift velocity with increased Ge concentration from 3.1±0.2 m/s for CoFe to 8.2±0.6 m/s for (CoFe)0.7Ge0.3. Interpretation of these values yields current polarization increasing from 0.84±0.04 to 0.95±0.05 as the Ge doping increases. While both spin-dependent conductivities decrease with increasing Ge concentration, the maximum in polarization is associated with a stronger relative change in the minority spin conductivity.

Details

ISSN :
10773118 and 00036951
Volume :
98
Database :
OpenAIRE
Journal :
Applied Physics Letters
Accession number :
edsair.doi...........7ccbfe809fc45b41844bcfbce658adcb
Full Text :
https://doi.org/10.1063/1.3554755