Excitation of whispering gallery magnons in a magnetic vortex

Schultheiss, Katrin; Verba, Roman; Wehrmann, Franziska; Wagner, Kai; Körber, Lukas; Hula, Tobias; Hache, Toni; Kákay, Attila; Awad, Ahmad A.; Tiberkevich, Vasyl; Slavin, Andrei N.; Fassbender, Jürgen; Schultheiss, Helmut

doi:10.1103/PhysRevLett.122.097202

Excitation of whispering gallery magnons in a magnetic vortex

Schultheiss, K.; Verba, R.; Wehrmann, F.; Wagner, K.; Körber, L.; Hula, T.; Hache, T.; Kákay, A.; Awad, A. A.; Tiberkevich, V.; Slavin, A. N.; Fassbender, J.; Schultheiss, H.

Abstract

We present the generation of whispering gallery magnons with unprecedented high wave vectors via nonlinear 3-magnon scattering in a μm-sized magnetic vortex state disc. These modes exhibit a strong localisation at the perimeter of the disc and practically zero amplitude in an extended area around the vortex core. They originate from the splitting of the fundamental radial magnon modes, which can be resonantly excited in a vortex texture by an out-of-plane microwave field. We shed light on the basics of this non-linear scattering mechanism from experimental and theoretical point of view. Using Brillouin light scattering (BLS) microscopy, we investigated the frequency and power dependence of the 3-magnon splitting. The spatially resolved mode
profiles give evidence for the localisation at the boundaries of the disc and allow for a direct determination of the modes wavenumber.

Keywords: magnons; spin wave; nonlinear magnetization dynamics; magnetic vortex; Brillouin light scattering

Beteiligte Forschungsanlagen

Ionenstrahlzentrum DOI: 10.17815/jlsrf-3-159

Verknüpfte Publikationen

DOI: 10.17815/jlsrf-3-159 is cited by this (Id 28116) publication

Physical Review Letters 122(2019), 097202
DOI: 10.1103/PhysRevLett.122.097202
Cited 57 times in Scopus
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