Interplay between the coherent and dissipative cavity–magnon couplings in a nearly closed cavity

In an electromagnetic resonant cavity containing a magnetic element, the cavity and magnon modes can establish a dissipative-type coupling by their mutual coupling to a third, highly dissipative mode. This dissipative coupling has been predominantly observed in semi-open cavities coupled to traveling waves. Here, we show that contrary to common expectations, even in typical nearly closed cavities, both coherent and dissipative couplings exist and interplay to determine the behaviors of cavity and magnon modes. Furthermore, their different positional dependences allow one to manipulate their interplay by changing the location of the magnon system inside the cavity. This work significantly broadens the scope of systems in which dissipative coupling can be realized and manipulated.