Universality of thermally assisted magnetic domain wall motion under spin torque

Details Universality of thermally assisted magnetic domain wall motion under spin torque Universality of thermally assisted magnetic domain wall motion under spin torque

2004-11-10

arxiv.org/abs/cond-mat/0411250v1

Appl. Phys. lett. 86, 252509 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1063/1.1951058

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., $\ln v \sim \frac{\pi\hbar}{2e}(\Is/\kB T)$. This behavior, which is independent of pinning and material constants, could be used to confirm experimentally the spin torque as the driving mechanism.

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