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  • Letter

Gyromagnetic bifurcation in a levitated ferromagnetic particle

T. Sato1, T. Kato1, Daigo Oue2,3,4, and M. Matsuo2,5,6,7

  • 1Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
  • 2Kavli Institute for Theoretical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
  • 3The Blackett Laboratory, Imperial College London, London SW7 2AZ, United Kingdom
  • 4Instituto de Telecomunicaçōes, Instituto Superior Técnico, University of Lisbon, 1049-001 Lisboa, Portugal
  • 5CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China
  • 6Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan
  • 7RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan

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Phys. Rev. B 107, L180406 – Published 30 May, 2023

DOI: https://doi.org/10.1103/PhysRevB.107.L180406

Abstract

We examine the mechanical rotation of a levitated magnetic particle that is induced by ferromagnetic resonance under microwave irradiation. We show that two stable solutions appear in a certain range of parameters by bifurcation when the rotation frequency is comparable to the microwave frequency. This phenomenon originates from the coexistence of the Barnett and the Einstein–de Haas effects. We also reveal that this measurement is sensitive to the strength of the spin-rotation coupling. Our work provides a platform for accessing a microscopic relaxation process from spin to macroscopic rotation.

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Phys. Rev. B 107, L180406– Published 30 May, 2023
  • Received 4 February 2022
  • Revised 11 May 2023
  • Accepted 15 May 2023
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