Phenomenology of Current-Induced Dynamics in Antiferromagnets

Details Phenomenology of Current-Induced Dynamics in Antiferromagnets Phenomenology of Current-Induced Dynamics in Antiferromagnets

2010-12-27

arxiv.org/abs/1012.5655v2

Phys. Rev. Lett. 106, 107206 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Final version accepted by Physical Review Letters

Scientific paper

10.1103/PhysRevLett.106.107206

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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