Spin Hall and Spin Swapping Torques in Diffusive Ferromagnets

Physical Review Letters
Christian Ortiz PauyacSergey A Nikolaev

Abstract

A complete set of the generalized drift-diffusion equations for a coupled charge and spin dynamics in ferromagnets in the presence of extrinsic spin-orbit coupling is derived from the quantum kinetic approach, covering major transport phenomena, such as the spin and anomalous Hall effects, spin swapping, spin precession, and relaxation processes. We argue that the spin swapping effect in ferromagnets is enhanced due to spin polarization, while the overall spin texture induced by the interplay of spin-orbital and spin precession effects displays a complex spatial dependence that can be exploited to generate torques and nucleate or propagate domain walls in centrosymmetric geometries without the use of external polarizers, as opposed to the conventional understanding of spin-orbit mediated torques.

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Citations

Jul 25, 2019·Nature Nanotechnology·Wenrui WangXin Fan
Dec 2, 2020·Physical Review Letters·Kyoung-Whan Kim, Kyung-Jin Lee
Jun 15, 2021·Journal of Applied Physics·V P AminM D Stiles
Oct 31, 2021·Nature Communications·Yuki HibinoShinji Yuasa

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