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Excitation of Whispering Gallery Magnons in a Magnetic Vortex

Journal article
Authors K. Schultheiss
R. Verba
F. Wehrmann
K. Wagner
L. Körber
T. Hula
T. Hache
A. Kákay
Ahmad Awad
V. Tiberkevich
A. N. Slavin
J. Fassbender
H. Schultheiss
Published in Physical Review Letters
Volume 122
ISSN 0031-9007
Publication year 2019
Published at Department of Physics (GU)
Language en
Keywords whispering gallery, magnons, Spintronics, Brillouin light scattering
Subject categories Physical Sciences, Condensed Matter Physics, Nano Technology, Magnetism


We present the generation of whispering gallery magnons with unprecedented high wave vectors via nonlinear 3-magnon scattering in a μm-sized magnetic Ni81Fe19 disc which is in the vortex state. These modes exhibit a strong localization 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 nonlinear scattering mechanism from an experimental and theoretical point of view. Using Brillouin light scattering microscopy, we investigated the frequency and power dependence of the 3-magnon splitting. The spatially resolved mode profiles give evidence for the localization at the boundaries of the disc and allow for a direct determination of the modes wave number.

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