Magnomechanical backaction corrections due to coupling to higher-order Walker modes and Kerr nonlinearities

Physical review. B./Physical review. B, vol. 107

Abstract

The radiation pressurelike coupling between magnons and phonons in magnets can modify the phonon frequency (magnomechanical spring effect) and decay rate (magnomechanical decay) via dynamical backaction. Such effects have been recently observed by coupling the uniform magnon mode of a magnetic sphere (the Kittel mode) to a microwave cavity. In particular, the ability to evade backaction effects was demonstrated [C. A. Potts et al., Phys. Rev. B 107, L140405 (2023)], a requisite for applications such as magnomechanical-based thermometry. However, deviations were observed from the predicted magnomechanical decay rate within the standard theoretical model. In this work, we account for these deviations by considering corrections due to (i) magnetic Kerr nonlinearities and (ii) the coupling of phonons to additional magnon modes. Provided that such additional modes couple weakly to the driven cavity, our model yields a correction proportional to the average Kittel magnon mode occupation. We focus our results on magnetic spheres, where we show that the magnetostatic Walker modes couple to the relevant mechanical modes as efficiently as the Kittel mode. Our model yields excellent agreement with the experimental data.

Authors 5

1. Victor A. S. V. Bittencourt

   Université de Strasbourg · Institut de Science et d'Ingénierie Supramoléculaires · Max Planck Institute for the Science of Light

   Affiliation as printed

   ISIS (UMR 7006), Université de Strasbourg, 67000 Strasbourg, France

   Max Planck Institute for the Science of Light, Staudtstraße 2, PLZ 91058 Erlangen, Germany

2. C. A. Potts

   University of Alberta · Delft University of Technology

   Affiliation as printed

   Department of Physics, University of Alberta, Edmonton, Alberta, Canada T6G 2E9

   Kavli Institute of NanoScience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, Netherlands

3. Yunhu Huang

   University of Alberta

   Affiliation as printed

   Department of Physics, University of Alberta, Edmonton, Alberta, Canada T6G 2E9

4. J. P. Davis

   University of Alberta

   Affiliation as printed

   Department of Physics, University of Alberta, Edmonton, Alberta, Canada T6G 2E9

5. Silvia Viola Kusminskiy Aachen Institute for Theoretical Solid State Physics

   RWTH Aachen University · Max Planck Institute for the Science of Light

   Affiliation as printed

   Institute for Theoretical Solid State Physics, RWTH Aachen University, 52074 Aachen, Germany

   Max Planck Institute for the Science of Light, Staudtstraße 2, PLZ 91058 Erlangen, Germany