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arXiv 1012.5655cond-mat.mes-hallcond-mat.mtrl-scicond-mat.other
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反铁磁体中电流感生动力学的唯象

Phenomenology of Current-Induced Dynamics in Antiferromagnets

Kjetil M. D. Hals, Yaroslav Tserkovnyak, Arne Brataas

摘要:

我们导出了反铁磁体中电流感生交错磁化动力学的唯象理论。该理论捕获的反应和耗散电流感应转矩和传统的磁场和阻尼的影响。Walker模型描述了无耗散时直流电流引起的畴壁运动。如果考虑磁阻尼和耗散力矩,当畴壁缓慢移动时,Walker阻尼器仍然是鲁棒的。在铁磁体中,畴壁速度与耗散转矩和磁化阻尼之间的比率成比例。此外,电流驱动的反铁磁畴壁获得净磁矩。

英文摘要:

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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