Thermally-Assisted Current-Driven Domain Wall Motion

Details Thermally-Assisted Current-Driven Domain Wall Motion Thermally-Assisted Current-Driven Domain Wall Motion

2006-07-25

arxiv.org/abs/cond-mat/0607663v1

Physics

Condensed Matter

Materials Science

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.98.056605

Starting from the stochastic Landau-Lifschitz-Gilbert equation, we derive Langevin equations that describe the nonzero-temperature dynamics of a rigid domain wall. We derive an expression for the average drift velocity of the domain wall as a function of the applied current, and find qualitative agreement with recent magnetic semiconductor experiments. Our model implies that at any nonzero temperature the average domain-wall velocity initially varies linearly with current, even in the absence of non-adiabatic spin torques.

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