Universality of thermally assisted magnetic domain wall motion under spin torque

Abstract

Thermally assisted motion of magnetic domain wall under spin torque is studied theoretically. It is shown that the wall velocity $v$ depends exponentially on the spin current, $\Is$, below the threshold value, in the same way as in a thermally activated motion driven by a force. A novel property of the spin torque driven case at low temperature is that the linear term in spin current is universal, i.e., $\ln v \sim \frac{π\hbar}{2e}(\Is/\kB T)$. This behavior, which is independent of pinning and material constants, could be used to confirm experimentally the spin torque as the driving mechanism.

References in corpus (7)

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• Theory of Current-Driven Domain Wall Motion: A Poorman's Approach
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• Threshold Current of Domain Wall Motion under Extrinsic Pinning, $\beta$-Term and Non-Adiabaticity
• Effective gauge field theory of spintronics
• Thermally-Assisted Current-Driven Domain Wall Motion
• Current-induced noise and damping in non-uniform ferromagnets
• Theory of Domain Wall Dynamics under Current
• Creep of current-driven domain-wall lines: intrinsic versus extrinsic pinning
• Current-driven and field-driven domain walls at nonzero temperature
• Current-induced motion of a domain wall in magnetic nanowires
• Supercurrent induced domain wall motion