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

Published

April 23, 2010

Author(s)

Meng Zhu, Cindi L. Dennis, Robert McMichael

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

Pub Type

Journals

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Keywords

spin waves, Doppler, spin transfer torque, magnetism, ferromagnetic metals, current polarization, spin current

Citation

Zhu, M. , Dennis, C. and McMichael, R. (2010), Temperature dependence of adiabatic spin transfer torque and current polarization in Ni80Fe20 by spin wave Doppler measurements, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=904177 (Accessed October 15, 2025)