Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 35: Poster 2
MA 35.8: Poster
Donnerstag, 8. September 2022, 16:00–18:00, P4
Spontaneous emergence of spin-wave frequency combs mediated by vortex gyration — •Christopher Heins1, Katrin Schultheiss1, Lukas Körber1,2, Attila Kákay1, Tobias Hula1,3, Mauricio Bejarano1,2, Vadym Iurchuk1, 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 the spin-wave frequency comb formation in a confined system, a magnetic vortex. The magnetic vortex shows rich spin-wave dynamics like the formation of whispering gallery magnons and non locally induced three-magnon scattering, all with frequencies in the GHz range. 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 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, which leads to the formation of frequency combs. Analyzing the mode profiles of the sidebands by micromagnetic simulations, shows that the comb is generated via three magnon scattering under conservation of energy and angular momentum.
The authors acknowledge financial support from the Deutsche Forschungsgemeinschaft within program SCHU 2922/1-1.