Electrically controlled nonlinear magnon-magnon coupling in a synthetic antiferromagnet

人工フェリ磁性体における非線形マグノン-マグノン結合の電気的制御

Sud, A.*; 山本 慧   ; 飯浜 賢志*; 石橋 一晃*; 深見 俊輔*; 紅林 秀和*; 水上 成美*

Sud, A.*; Yamamoto, Kei; Iihama, Satoshi*; Ishibashi, Kazuaki*; Fukami, Shunsuke*; Kurebayashi, Hidekazu*; Mizukami, Shigemi*

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