SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 23: Poster Magnetism I
MA 23.78: Poster
Dienstag, 28. März 2023, 17:00–19:00, P1
Spontaneous emergence of spin-wave frequency combs mediated by vortex gyration — •Christopher Heins1,2, Katrin Schultheiss1, Lukas Körber1,2, Attila Kákay1, Tobias Hula1,3, Mauricio Bejarano1,2, Jürgen Lindner1, Jürgen Fassbender1,2, and Helmut Schultheiss1,2 — 1Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 2Fakultät Physik, Technische Universität Dresden, Dresden, Germany — 3Institut für Physik, Technische Universität Chemnitz, Chemnitz, Germany
We present experimental investigations of spin-wave frequency combs forming in a confined system, a magnetic vortex. The magnetic vortex shows rich spin-wave dynamics with frequencies in the GHz range, which can be harnessed for pattern recognition [1]. Additionally, there is the low frequency gyration of the vortex core itself. The combination of these dynamics on two different time scales inside magnetic vortices, results in the generation of spin-wave frequency combs with their spacing given by the vortex gyration frequency. Using time-resolved Brillouin light scattering microscopy, we show that large amplitude excitations of spin waves purely in the GHz range can induce a gyration of the vortex core and vice versa, which leads to the formation of frequency combs.
The authors acknowledge financial support from the Deutsche Forschungsgemeinschaft within program SCHU 2922/1-1.
[1] L. Körber, et al., arXiv preprint arXiv:2211.02328 (2022).