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MA: Fachverband Magnetismus

MA 11: Posters Magnetism III

MA 11.8: Poster

Wednesday, September 29, 2021, 13:30–16:30, P

Magnon condensates in magnetization landscapes — •Matthias R. Schweizer, Alexander J.E. Kreil, Georg von Freymann, Alexander A. Serga, and Burkard Hillebrands — Fachbereich Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, Kaiserslautern, Germany

In this study, we demonstrate the potential to control a magnon condensate by spatial modulation of the saturation magnetization.
As shown in previous studies, a magnon condensate can be created via parallel parametric pumping in a stripline-resonator. We use a 458 nm laser in combination with a phase-based wavefront modulation technique to create confined temperature patterns in an yttrium-iron-garnet film of 5 µm thickness, which result in a decrease of the local saturation magnetization and in modify the local frequency of the condensate. The magnon density is measured by means of k-vector-resolved Brillouin-light-scattering-spectroscopy. We provide evidence of strong, directed magnon accumulation by magnon supercurrents [1] and anomalous decay behavior for several distances between heated positions.
Funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - TRR 173 - 268565370.

[1] D. A. Bozhko et al., Nat Commun 10, 2460 (2019)