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Universality of thermally assisted magnetic domain wall motion under spin torque

Gen Tatara·Nicolas Vernier·Jacques Ferre
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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.

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Gen Tatara, Nicolas Vernier, Jacques Ferre. 2004-11-10. Universality of thermally assisted magnetic domain wall motion under spin torque. https://doi.org/10.1063/1.1951058

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