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

Tatara, Gen; Vernier, Nicolas; Ferré, Jacques
June 2005
Applied Physics Letters;6/20/2005, Vol. 86 Issue 25, p252509
Academic Journal
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 significant property of the spin torque driven case at low temperature is that the linear term in spin current is universal, i.e., In v∼πh/2e(Is/kBT). 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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