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Heavy metal/ferromagnet interfaces feature emergent spin-orbit effects absentin the bulk materials. Because of their inherent strong coupling between spin,charge and orbital degrees of freedom, such systems provide a platform fortechnologically sought-after spin-orbit torques (SOTs). However, themicroscopic origin of purely interfacial antidamping SOT, especially in theultimate atomically thin limit, has proven elusive. Here, using two-dimensional(2D) van der Waals materials as a testbed for interfacial phenomena, we addressthis problem by means of a microscopic framework accounting for band structureeffects and impurity scattering on equal footing and nonperturbatively. Anumber of unconventional and measurable effects are predicted, the mostremarkable of which is a giant enhancement of antidamping SOT in the dilutedisorder limit induced by a robust skew scattering mechanism, which isoperative in realistic interfaces and does not require magnetic impurities. Thenewly unveiled skew scattering mechanism activates rich semiclassicalspin-charge conversion effects that have gone unnoticed in the literature,including a collinear Edelstein effect with nonequilibrium spin polarizationaligned with the direction of the applied current.

physical review research

Skew-scattering-induced giant antidamping spin-orbit torques: Collinear  and out-of-plane Edelstein effects at two-dimensional material/ferromagnet  interfaces