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Electrically Controlled Nonlinear Magnon-Magnon Coupling in a Synthetic Antiferromagnet
A Sud1,2, K Yamamoto3, S Iihama1,4
1Tohoku University, Frontier Research Institute for Interdisciplinary Sciences, 6-3 Aoba, Sendai 980-8578, Japan.
None:
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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