Inverse Spin-Galvanic Effect in a Topological-Insulator/Ferromagnet Interface

Details Inverse Spin-Galvanic Effect in a Topological-Insulator/Ferromagnet Interface Inverse Spin-Galvanic Effect in a Topological-Insulator/Ferromagnet Interface

2009-11-02

arxiv.org/abs/0911.0106v1

Phys. Rev. Lett. 104, 146802 (2010)

Physics

Condensed Matter

Materials Science

4 pages, 2 figures; submitted to Phys. Rev. Lett

Scientific paper

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.

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