  Pump-induced magnon modes (PIMs) are recently discovered elementary
excitations in ferrimagnets that offer significant tunability to spin dynamics.
Here, we investigate the coupling between a PIM and cavity magnon polaritons
(CMPs) by driving a cavity magnonic system away from equilibrium with a
microwave pump. In our experiment, the Walker mode simultaneously couples with
the PIM and cavity photons and thus combines two strongly coherent coupling
processes in a single cavity structure. Such a PIM-CMP hybridization system
acquires complementary properties from both the PIM and CMPs, allowing it to be
freely manipulated by the magnetic field, the pump power and the pump
frequency. These coherent manipulations exhibit unique behaviors beyond the
intrinsic properties limited by the material nature and electromagnetic
boundary conditions, thereby creating opportunities for extending the control
of hybrid devices.
