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The control of the magnetism of ultra-thin ferromagnetic layers using anelectric field rather than a current, if large enough, would lead to manytechnologically important applications. To date, while it is usually assumedthe changes in the magnetic anisotropy, leading to such a control, arises fromsurface charge doping of the magnetic layer, a number of key experiments cannotbe understood within such a scenario. Much studied is the fact that, fornon-magnetic metals or semi-conductors, a large surface electric field givesrise to a Rashba spin-orbit coupling which leads to a spin-splitting of theconduction electrons. For a magnet, this splitting is modified by the exchangefield resulting in a large magnetic anisotropy energy via theDzyaloshinskii-Moriya mechanism. This different, yet traditional, path to anelectrically induced anisotropy energy can explain the electric field,thickness, and material dependence reported in many experiments.

Rashba Spin-Orbit Anisotropy and the Electric Field Control of Magnetism