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MA: Fachverband Magnetismus
MA 10: Magnetization Dynamics I
MA 10.1: Talk
Monday, March 14, 2011, 14:45–15:00, HSZ 403
Direct observation of four-magnon scattering in spin-wave micro-conduits — Helmut Schultheiss1,2, •Katrin Vogt1, Philipp Pirro1, Thomas Brächer1, and Burkard Hillebrands1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany — 2Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
We report on experiments which demonstrate the intrinsic nonlinear damping of spin waves due to four-magnon scattering processes in a micrometer sized permalloy stripe. The magnetization is excited by a microwave current transmitted through the shorted end of a coplanar waveguide. The excitation spectrum of the spin wave is locally probed by Brillouin light scattering microscopy for different excitation frequencies covering a range of excitation powers over three orders of magnitude. We find a transition from a pure and clean monochromatic excitation of spin waves at low microwave powers to a large broadening above a certain threshold power. The spectral distribution of the measured spin-wave intensities shows a unique profile which is in good agreement with theoretical expectations for four-magnon scattering processes.
Financial support by the Carl-Zeiss-Stiftung and the Graduate School of Excellence “Materials Science in Mainz” is gratefully acknowledged. The authors thank the Nano+Bio Center of the Technische Universität Kaiserslautern and A. Beck for sample preparation.