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MA: Fachverband Magnetismus

MA 26: Spin Dynamics / Spin -Torque II

MA 26.7: Talk

Thursday, February 28, 2008, 16:00–16:15, EB 301

Propagation, Dispersion and Interference of Spin Waves in Ferromagnetic Thin Films — Korbinian Perzlmaier, •Wolfgang Scheibenzuber, Frank Hoffmann, Georg Woltersdorf, and Christian H. Back — Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Universitätsstr. 31, 93040 Regensburg

The propagation and interference of spin waves has been observed in 20 nm thick Ni₈₀Fe₂₀ films by time and space resolved scanning Kerr microscopy. The sample is a continuous thin film with a CPS (coplanar stripline) patterned along one edge of the sample. Using cw (continuous wave) or pulsed microwave excitation, the phase velocities, group velocities, and dispersion relations have been determined in two geometries of an externally applied magnetic in plane bias field, namely the DE (Damon Eshbach) and MSBV (Magneto Static Backward Volume) geometries. Analytical calculations based on the linearized LLG (Landau Lifshitz Gilbert) equation reproduce the experimental findings.

Further on, we report on the interference of propagating spin waves in continuous ferromagnetic films.