Regensburg 2007 – scientific programme

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MA: Fachverband Magnetismus

MA 33: Spindynamics / Switching III

MA 33.5: Talk

Friday, March 30, 2007, 12:00–12:15, H23

Propagation of Spin-Waves in Ferromagnetic Thin Films — •Korbinian Perzlmaier, Georg Woltersdorf, and Christian Back — Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Universitätsstr. 31, 93040 Regensburg

In our aim to investigate the behaviour of spin-waves in interaction with different magnetic or topological potentials, we have observed the propagation of spin-waves and packets of spin-waves in a continuous 20nm thick Ni₈₀Fe₂₀ film upon microwave excitation. A magnetic in-plane bias field is applied to the sample in the Damon-Eschbach (DE) or Magneto Static Backward Volume Modes (MSBVM) geometry. Time Resolved Scanning Kerr Microscopy (TRSKEM) is used to detect the out-of plane component of the magnetization. The propagation of DE- and MSBVM- modes was optically detected over a range of some 50µm. In doing so, we are able to directly determine the phase- and group velocity of spin-waves and spin-wave packets propagating in a ferromagnetic thin film.