Spin excitations in nanometric magnetic dots: calculations and comparison with lightscattering measurements

Abstract

Recent theoretical results obtained in the field of spin excitations in nanometric magneticdots are reviewed. The dynamical matrix method and analytical approaches are describedand applied to the cases of circular and elliptical planar permalloy dots. For discs, the spindynamics in the vortex and saturated states is investigated. For saturated ellipses,the dependence of frequencies and mode profiles is studied as a function of thedirection of the in-plane applied field and dot eccentricity. The results allow us tointerpret Brillouin scattering data in terms of mode symmetry and localization.