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Phys Rev Lett. 2010 Apr 9;104(14):146802. Epub 2010 Apr 9.

Inverse spin-galvanic effect in the interface between a topological insulator and a ferromagnet.

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Department of Physics and Astronomy, The University of British Columbia, Vancouver, BC V6T 1Z1, Canada.


When a ferromagnet is deposited on the surface of a topological insulator the topologically protected surface state develops a gap and becomes a two-dimensional quantum Hall liquid. We demonstrate that the Hall current in such a liquid, induced by an external electric field, can have a dramatic 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.

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