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Electrically Controlled Nonlinear Magnon-Magnon Coupling in a Synthetic Antiferromagnet

A. Sud1,2, K. Yamamoto3, S. Iihama1,4,†, K. Ishibashi5,4, S. Fukami2,4,6, H. Kurebayashi4,7,8, and S. Mizukami4,6,*

  • 1Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, 6-3 Aoba, Sendai 980-8578, Japan
  • 2Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Sendai 980-8577, Japan
  • 3Advanced Science Research Center, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai 319-1195, Japan
  • 4WPI Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Sendai 980-8577, Japan
  • 5Department of Applied Physics, Tohoku University, 6-6-05 Aoba, Sendai 980-8579, Japan
  • 6Center for Science and Innovation in Spintronics, Tohoku University, 2-1-1 Katahira, Sendai 980-8577, Japan
  • 7London Centre for Nanotechnology, University College London, 17-19 Gordon Street, London WC1H 0AH, United Kingdom
  • 8Department of Electronic and Electrical Engineering, University College London, London WC1E 7JE, United Kingdom

  • *Contact author: shigemi.mizukami.a7@tohoku.ac.jp
  • †Present address: Department of Materials Physics, Nagoya University, Nagoya 464-8603, Japan.
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Phys. Rev. Lett. 134, 246704 – Published 20 June, 2025

DOI: https://doi.org/10.1103/sc6y-rxbg

Abstract

We investigate the nonlinear coupling between acoustic (ac) and optical (op) modes in the coupled magnetization dynamics of synthetic antiferromagnets, utilizing current-driven resonance spectroscopy. A clear spectral splitting is evident in the ac mode when strongly excited by the radio frequency current at a driving frequency half that of the op mode resonance. The Landau-Lifshitz phenomenology aligns with the experimental observations, affirming the coupling of the radio-frequency-excited ac and op modes through three-magnon mixing. The nonlinearity enables a Rabi-like splitting in an in-plane magnetized synthetic antiferromagnet without breaking its natural symmetries. This discovery holds potential for advancing our understanding of nonlinear antiferromagnetic dynamics.

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Phys. Rev. Lett. 134, 246704– Published 20 June, 2025
  • Received 24 June 2024
  • Revised 13 May 2025
  • Accepted 20 May 2025
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