Chirality Sensitive Domain Wall Motion in Spin-Orbit Coupled Ferromagnets
Abstract
Using the Lagrangian formalism, we solve analytically the equations of motion for current-induced domain-wall dynamics in a ferromagnet with Rashba spin-orbit coupling. An exact solution for the domain wall velocity is provided, including the effect of non-equilibrium conduction electron spin-density, Gilbert damping, and the Rashba interaction parameter. We demonstrate explicitly that the influence of spin-orbit interaction can be qualitatively different from the role of non-adiabatic spin-torque in the sense that the former is sensitive to the chirality of the domain wall whereas the latter is not: the domain wall velocity shows a reentrant behavior upon changing the chirality of the domain wall. This could be used to experimentally distinguish between the spin-orbit and non-adiabatic contribution to the wall speed. A quantitative estimate for the attainable domain wall velocity is given, based on an experimentally relevant set of parameters for the system.
Cite
@article{arxiv.1302.4744,
title = {Chirality Sensitive Domain Wall Motion in Spin-Orbit Coupled Ferromagnets},
author = {Jacob Linder},
journal= {arXiv preprint arXiv:1302.4744},
year = {2015}
}
Comments
7 pages, 2 figures. Accepted for publication in Phys. Rev. B