Regensburg 2013 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 49: Magnetization Dynamics III of 3

MA 49.10: Vortrag

Freitag, 15. März 2013, 11:45–12:00, H22

Effects of the lattice discreteness on the Damon-Eshbach mode — •Julian Hüser, Thomas Kendziorczyk, and Tilmann Kuhn — Institut für Festkörpertheorie, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster

Spin wave dispersion relations in ferromagnetic thin films are often calculated within a continuum model based on the Landau-Lifshitz equation thereby neglecting the underlying lattice structure in real materials. In this talk we present and analyze some differences between the magnetostatic modes obtained in a lattice model and the well known results of Damon and Eshbach. For this purpose we calculate the spin wave dispersion with a discrete model consisting of classical spins which are stacked on a cubic lattice and interact only via dipolar forces. The discrete model yields new qualitative features in comparison with the results of Damon and Eshbach. We observe several surface modes and the degeneracy of the spin waves which propagate perpendicularly to the applied magnetic field is lifted. These modes form a quasi-continuous volume band in which hybridizations between the modes take place.