When a ferromagnet is deposited on the surface of a topological insulator the topologically protected surface state develops a gap and becomes a 2-dimensional quantum Hall liquid. We demonstrate that the Hall current in such a liquid, induced by an external electric field, can have a large effect on the magnetization dynamics of the ferromagnet by changing the effective anisotropy field. This change is dissipationless and may be substantial even in weakly spin-orbit coupled ferromagnets. We study the possibility of dissipationless current-induced magnetization reversal in monolayer-thin, insulating ferromagnets with a soft perpendicular anisotropy and discuss possible applications of this effect.
@article{arxiv.0911.0106,
title = {Inverse Spin-Galvanic Effect in a Topological-Insulator/Ferromagnet Interface},
author = {Ion Garate and M. Franz},
journal= {arXiv preprint arXiv:0911.0106},
year = {2015}
}