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arXiv · 1907.02041

Anisotropy of spin-transfer torques and Gilbert damping induced by Rashba coupling

I. A. Ado·P. M. Ostrovsky·M. Titov
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Abstract

Spin-transfer torques (STT), Gilbert damping (GD), and effective spin renormalization (ESR) are investigated microscopically in a 2D Rashba ferromagnet with spin-independent Gaussian white-noise disorder. Rashba spin-orbit coupling induced anisotropy of these phenomena is thoroughly analysed. For the case of two partly filled spin subbands, a remarkable relation between the anisotropic STT, GD, and ESR is established. In the absence of magnetic field and other torques on magnetization, this relation corresponds to a current-induced motion of a magnetic texture with the classical drift velocity of conduction electrons. Finally, we compute spin susceptibility of the system and generalize the notion of spin-polarized current.

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I. A. Ado, P. M. Ostrovsky, M. Titov. 2019-07-03. Anisotropy of spin-transfer torques and Gilbert damping induced by Rashba coupling. https://doi.org/10.1103/physrevb.101.085405

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