Thermally assisted current-driven domain-wall motion

被引：74

作者：

Duine, R. A.

Nunez, A. S.

MacDonald, A. H.

机构：

[1] Univ Utrecht, Inst Theoret Phys, NL-3584 CE Utrecht, Netherlands

[2] Univ Texas, Dept Phys, Austin, TX 78712 USA

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 05期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.98.056605

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 < r(dw)> as a function of the applied current, and find qualitative agreement with recent magnetic semiconductor experiments. Our model implies that at any nonzero-temperature < r(dw)> initially varies linearly with current, even in the absence of nonadiabatic spin torques.

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页数：4

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