Rashba spin orbit torque

The Manchon that everyone is torqueing about

A PRB from “Mr SOT theory” Aurelien Manchon describing the Rashba spin-orbit torque (SOT).  While the vast majoiry of the paper is unpenetrable theory and equations, the conclusion that their model of the Rashba SOT gives field like, anti-damping like, and z x m and m x (z  x m) terms that are consistent with the previous odd observations of Miron.  The final two terms are attributed to anisotropy in spin relaxation time:

http://prb.aps.org/abstract/PRB/v89/i5/e054405

Image: Kevin Shorter, Some rights reserved