Dresden 2009 – scientific programme

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MA: Fachverband Magnetismus

MA 17: Magnetic Thin Films I

MA 17.10: Talk

Wednesday, March 25, 2009, 12:30–12:45, HSZ 04

Microscopic theory of spin waves in ferromagnetic films — •Andreas Kreisel, Francesca Sauli, and Peter Kopietz — Institut für Theoretische Physik, Universität Frankfurt, Max-von-Laue Straße 1, 60438 Frankfurt/Main

Motivated by experiments on finite ferromagnetic films consisting of Yttrium iron garnet (YIG), we have used a microscopic method of calculating the spin-wave spectrum in those systems. Both the long range magnetic dipole-dipole interactions and the Heisenberg exchange interactions are taken into account in our approach. We calculate the spin wave energy as well as the magnon states and compare our results with predictions based on the phenomenological Landau-Lifshitz equation and with experiments on YIG films.