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Optimizing the Magnon-Phonon Cooperativity in Planar Geometries

K. An1, C. Kim1, K.-W. Moon1, R. Kohno2, G. Olivetti2, G. de Loubens3, N. Vukadinovic4, J. Ben Youssef5, C. Hwang1,* et al.

O. Klein2,†

  • 1Quantum Technology Institute, Korea Research Institute of Standards and Science, Daejeon 34113, Republic of Korea
  • 2Université Grenoble Alpes, CEA, CNRS, Grenoble INP, Spintec, Grenoble 38054, France
  • 3SPEC, CEA-Saclay, CNRS, Université Paris-Saclay, Gif-sur-Yvette 91191, France
  • 4Dassault Aviation, Saint-Cloud 92552, France
  • 5LabSTICC, CNRS, Université de Bretagne Occidentale, Brest 29238, France

  • *Corresponding author: cyhwang@kriss.re.kr
  • †Corresponding author: oklein@cea.fr
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Phys. Rev. Applied 20, 014046 – Published 21 July, 2023

DOI: https://doi.org/10.1103/PhysRevApplied.20.014046

Abstract

Optimizing the cooperativity between two distinct particles is an important feature of quantum information processing. Of particular interest is the coupling between spin and phonon, which allows for integrated long-range communication between gates operating at gigahertz frequency. Using local light scattering, we show that, in magnetic planar geometries, this attribute can be tuned by adjusting the orientation and strength of an external magnetic field. The coupling strength is enhanced by about a factor of 2 for the out-of-plane magnetized geometry where the Kittel mode is coupled to circularly polarized phonons, compared to the in-plane one where it couples to linearly polarized phonons. We also show that the overlap between magnon and phonon is maximized by matching the Kittel frequency with an acoustic resonance that satisfies the half-wave-plate condition across the magnetic film thickness. Taking the frequency dependence of the damping into account, a maximum cooperativity of about 6 is reached in garnets for the normal configuration near 5.5 GHz.

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Phys. Rev. Applied 20, 014046– Published 21 July, 2023
  • Received 20 February 2023
  • Revised 16 June 2023
  • Accepted 26 June 2023
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