NIST logo

Publication Citation: Temperature dependence of adiabatic spin transfer torque and current polarization in Ni80Fe20 by spin wave Doppler measurements

NIST Authors in Bold

Author(s): Meng Zhu; Cindi L. Dennis; Robert D. McMichael;
Title: Temperature dependence of adiabatic spin transfer torque and current polarization in Ni80Fe20 by spin wave Doppler measurements
Published: April 23, 2010
Abstract: A spin wave Doppler technique is used to measure the temperature dependence of both the magnetization drift velocity and the current polarization in current-carrying Ni80Fe20 wires. For current densities of 1011 A/m2, we obtain magnetization drift velocities decreasing from 4.8 m/s {+or-} 0.4 m/s to 4.0 m/s {+or-} 0.1 m/s over a temperature range from 80 K to 340 K. Interpretation of velocity values yields current polarization dropping from 0.70{+or-}0.04 to 0:55{+or-}0.01 over the same temperature range. Analysis indicates diff erent temperature dependencies for spin-up and spin-down conductivities, suggesting a strong impurity scattering of spin-down electrons.
Citation: Physical Review B
Volume: 81
Pages: 4 pp.
Keywords: spin waves; Doppler; spin transfer torque; magnetism; ferromagnetic metals; current polarization; spin current
Research Areas: Nanoelectronics and Nanoscale Electronics
PDF version: PDF Document Click here to retrieve PDF version of paper (1MB)