Phenomenology of Current-Induced Dynamics in Antiferromagnets

Kjetil M. D. Hals, Yaroslav Tserkovnyak, and Arne Brataas
Phys. Rev. Lett. 106, 107206 – Published 10 March 2011

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.

  • Figure
  • Received 27 December 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.107206

© 2011 American Physical Society

Authors & Affiliations

Kjetil M. D. Hals1, Yaroslav Tserkovnyak2, and Arne Brataas1

  • 1Department of Physics, Norwegian University of Science and Technology, NO-7491, Trondheim, Norway
  • 2Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA

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Issue

Vol. 106, Iss. 10 — 11 March 2011

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