Phenomenology of Current-Induced Dynamics in Antiferromagnets

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

doi:10.1103/physrevlett.106.107206

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arXiv · 1012.5655

Phenomenology of Current-Induced Dynamics in Antiferromagnets

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

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Abstract

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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Kjetil M. D. Hals, Yaroslav Tserkovnyak, Arne Brataas. 2011-03-10. Phenomenology of Current-Induced Dynamics in Antiferromagnets. https://doi.org/10.1103/physrevlett.106.107206

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