Influence of magnetic viscosity on domain wall dynamics under spin-polarized currents

Abstract

We present a theoretical study of the influence of magnetic viscosity on current-driven domain wall dynamics. In particular we examine how domain wall depinning transitions, driven by thermal activation, are influenced by the adiabatic and nonadiabatic spin-torques. We find the Arrhenius law that describes the transition rate for activation over a single energy barrier remains applicable under currents but with a current-dependent barrier height. We show that the effective energy barrier is dominated by a linear current dependence under usual experimental conditions, with a variation that depends only on the nonadiabatic spin torque coefficient beta.

8 pages, 4 figures

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Cited by in corpus (3)

• Magnetic domain wall motion in a nanowire: depinning and creep
• Generalized analysis of thermally activated domain-wall motion in Co/Pt multilayers
• Thermal fluctuation field for current-induced domain wall motion