Nonlinear Tuning of Magnon-Photon Coupling through Pump-Induced Magnon Modes

We investigate the nonlinear tuning of magnon-photon interactions in a dissipative magnon-photon system by introducing a nonlinear pump-induced magnon (PIM) mode. By aligning the pump microwave frequency with either the magnon or cavity mode, we identify two distinct dynamical responses modulated by the pump-induced magnon. When the pump frequency aligns with the magnon mode frequency, the overall coupling strength of the three-mode system increases with pump power, showing an improvement 36% at a pump power of 18 dBm. When the pump frequency aligns with the cavity frequency, the coherent coupling between the PIM mode and the magnon mode competes with the dissipative magnon-photon interaction, suppressing the latter and driving the system toward a coherent coupling regime. These results demonstrate a viable approach for controlling the coupling strength and switching between dissipative and coherent coupling regimes via nonlinear magnon interactions, offering potential for tunable magnonic devices.