Strongly coupled magnon–phonon dynamics in a single nanomagnet

Cassidy Berk (), Mike Jaris, Weigang Yang, Scott Dhuey, Stefano Cabrini and Holger Schmidt
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Cassidy Berk: School of Engineering, University of California Santa Cruz
Mike Jaris: School of Engineering, University of California Santa Cruz
Weigang Yang: School of Engineering, University of California Santa Cruz
Scott Dhuey: Molecular Foundry, University of California Berkeley
Stefano Cabrini: Molecular Foundry, University of California Berkeley
Holger Schmidt: School of Engineering, University of California Santa Cruz

Nature Communications, 2019, vol. 10, issue 1, 1-6

Abstract: Abstract Polaritons are widely investigated quasiparticles with fundamental and technological significance due to their unique properties. They have been studied most extensively in semiconductors when photons interact with various elementary excitations. However, other strongly coupled excitations demonstrate similar dynamics. Specifically, when magnon and phonon modes are coupled, a hybridized magnon–phonon quasiparticle can form. Here, we report on the direct observation of coupled magnon–phonon dynamics within a single thin nickel nanomagnet. We develop an analytic description to model the dynamics in two dimensions, enabling us to isolate the parameters influencing the frequency splitting. Furthermore, we demonstrate tuning of the magnon–phonon interaction into the strong coupling regime via the orientation of the applied magnetic field.

Date: 2019
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DOI: 10.1038/s41467-019-10545-x

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