Anisotropy of spin-transfer torques and Gilbert damping induced by Rashba coupling
Abstract
Spin-transfer torques (STT), Gilbert damping (GD), and effective spin renormalization (ESR) are investigated microscopically in a two-dimensional Rashba ferromagnet with spin-independent Gaussian white-noise disorder. Rashba spin-orbit coupling-induced anisotropy of these phenomena is thoroughly analyzed. 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.
- Publication:
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Physical Review B
- Pub Date:
- February 2020
- DOI:
- 10.1103/PhysRevB.101.085405
- arXiv:
- arXiv:1907.02041
- Bibcode:
- 2020PhRvB.101h5405A
- Keywords:
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- Condensed Matter - Mesoscale and Nanoscale Physics
- E-Print:
- 20 pages, 4 figures