Symmetry dependence of spin-wave eigenmodes in Landau-domain patterns

Spin-wave eigenmodes in thin permalloy squares with Landau-domain patterns are investigated by micromagnetic simulation. Both the spatial symmetry of an exciting field pulse and the symmetry of the internal field determine the frequency and spatial distribution of the spin waves. With each symmetry, only a subset of all the possible eigenmodes can be observed. Our findings confirm the presence of longitudinally and transversally localized modes. Comparison with dispersion relations from analytical theory allows the unambiguous identification of the modes as backward volume and Damon-Eshbach modes, respectively. (C) 2007 Elsevier B.V. All rights reserved.