Phenomenology of Current-Induced Dynamics in Antiferromagnets

被引：192

作者：

Hals, Kjetil M. D. ^{[1
]}

Tserkovnyak, Yaroslav ^{[2
]}

Brataas, Arne ^{[1
]}

机构：

[1] Norwegian Univ Sci & Technol, Dept Phys, NO-7491 Trondheim, Norway

[2] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 10期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.106.107206

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We derive a phenomenological theory of current-induced staggered magnetization dynamics in antiferromagnets. The theory captures the reactive and dissipative current-induced torques and the conventional effects of magnetic fields and damping. A Walker ansatz describes the dc current-induced domain-wall motion when there is no dissipation. If magnetic damping and dissipative torques are included, the Walker ansatz remains robust when the domain wall moves slowly. As in ferromagnets, the domain-wall velocity is proportional to the ratio between the dissipative torque and the magnetization damping. In addition, a current-driven antiferromagnetic domain wall acquires a net magnetic moment.

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