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., lnv∼2eπℏ(\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.
@article{arxiv.cond-mat/0411250,
title = {Universality of thermally assisted magnetic domain wall motion under spin torque},
author = {Gen Tatara and Nicolas Vernier and Jacques Ferre},
journal= {arXiv preprint arXiv:cond-mat/0411250},
year = {2016}
}