Giant resonant skew scattering of plasma waves in a two-dimensional electron gas

While electron skew scattering by impurities is one of the major mechanisms behind the anomalous Hall effect in ferromagnetic nanostructures, it's not probed directly. The authors theoretically study here the skew scattering of plasma waves off of a micromagnet. They argue that it is giant and resonant due to a chiral interface mode circulating the magnet. This setup allows direct probes into individual skew scattering events, and provides insights into magnetic impurity scattering of Dirac electrons at the surface of topological insulators.