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Phase control of magnon-phonon coupling via magnetic field

Yasuhiro Todaka1, Motoki Asano2, Isamu Yasuda1, Masashi Kawaguchi1, Daiki Hatanaka2, and Masamitsu Hayashi1,3

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Phys. Rev. B 114, 084426 – Published 25 August, 2026

DOI: https://doi.org/10.1103/c74x-3j86

Abstract

We study the phase of the coupling between magnons and surface acoustic wave (SAW) phonons in magnetic thin films. The coupling constant changes from a real to a complex number as the external magnetic field is reduced. Below a transition field, the imaginary coupling constant allows SAW phonons to couple to overdamped magnons whose resonance frequency is close to zero and far from the SAW resonance. The strength of the imaginary coupling constant and the magnitude of the transition field both scale with magnetic damping. We find the coupling produces a broad, pronounced minimum in the SAW transmittance spectrum near zero magnetic field in a Ni/Ru/Ni synthetic antiferromagnet with large magnetic damping. These results demonstrate that the phase of the complex magnon-phonon coupling constant can be tuned via magnetic field in strongly damped magnets, offering a platform to explore novel regimes of magnon-phonon interactions.

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Outline

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Phys. Rev. B 114, 084426– Published 25 August, 2026
  • Received 7 November 2025
  • Revised 29 May 2026
  • Accepted 17 July 2026
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