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Brillouin light scattering is an established technique to study magnons, theelementary excitations of a magnet. Its efficiency can be enhanced by cavitiesthat concentrate the light intensity. Here, we theoretically study inelasticscattering of photons by a magnetic sphere that supports optical whisperinggallery modes in a plane normal to the magnetization. Magnons with low angularmomenta scatter the light in the forward direction with a pronounced asymmetryin the Stokes and the anti-Stokes scattering strength, consistent with earlierstudies. Magnons with large angular momenta constitute Damon Eschbach modes areshown to inelastically reflect light. The reflection spectrum contains either aStokes or anti-Stokes peak, depending on the direction of the magnetization, aselection rule that can be explained by the chirality of the Damon Eshbachmagnons. The controllable energy transfer can be used to manage thethermodynamics of the magnet by light.

Light scattering by magnons in whispering gallery mode cavities