Selection rules for cavity-enhanced Brillouin light scattering from magnetostatic modes

Journal article (2018)

Authors

James A. Haigh Hitachi Cambridge Laboratory
N. J. Lambert University of Cambridge
S. Sharma Kavli institute of nanoscience Delft, QN/Bauer Group - AS
Y.M. Blanter Kavli institute of nanoscience Delft, QN/Blanter Group - AS
G.E. Bauer QN/Bauer Group - AS , Tohoku University, Kavli institute of nanoscience Delft
A. J. Ramsay Hitachi Cambridge Laboratory
Research Group
QN/Bauer Group (AS) (TU Delft)
Copyright: © 2018 J. A. Haigh, N. J. Lambert, S. Sharma, Y.M. Blanter, G.E. Bauer, A. J. Ramsay
DOI: https://doi.org/10.1103/PhysRevB.97.214423
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Published Date

2018

Language

English

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Faculty

Applied Sciences

Department

QN/Quantum Nanoscience

Research Group

QN/Bauer Group

Abstract

We identify experimentally the magnetostatic modes active for Brillouin light scattering in the optical whispering gallery modes of a yttrium iron garnet sphere. Each mode is identified by magnetic-field dispersion of ferromagnetic-resonance spectroscopy and coupling strength to the known field distribution of the microwave drive antenna. Our optical measurements confirm recent predictions that higher-order magnetostatic modes can also generate optical scattering, according to the selection rules derived from the axial symmetry. From this we summarize the selection rules for Brillouin light scattering. We give experimental evidence that the optomagnonic coupling to nonuniform magnons can be higher than that of the uniform Kittel mode.