Fig. 4.

X-CMP dispersion. a Amplitude mappings of ${Ṽ}_x$ and ${Ṽ}_y$ plotted as a function of applied magnetic field measured for the configurations shown in the inset. White dashed lines indicate the expected magnon dispersion according to Kittel’s formula and the black dashed lines show the cavity frequency. b Dispersion of the hybridized modes. c Resonance feature of the longitudinal signal ${Ṽ}_x$ and the Hall signal ${Ṽ}_y$ near ${\omega }_m={\omega }_c$, where the central mode is at $\omega ={\omega }_c$. In (b, c), symbols are experimental data deduced from (a) and the dashed or solid lines are the calculated results using Eq. (2)