  For dipole-carrying excitations observed in a high-quality resonator,
strong-coupling modes can appear as composite bosons with the spontaneous
formation of quantized vortices in the condensed phase of a polariton fluid. In
exciton-polaritons, in particular, it leads to sustained trapping of the
emitted photon. In this paper, we show that magnon-polaritons can be realized
due to magnon condensation caused by magnetic dipole-dipole interaction. In a
quasi-2D ferrite disk placed in a microwave cavity, one observes quantum
confinement effects of magnetic-dipolar-mode (MDM) oscillations. These modes,
characterized by energy eigenstates with rotational superflows and quantized
vortices, are exhibited as spinor condensates. Along with the condensation of
MDM magnons in the quasi-2D disk of the magnetic insulator, electric dipole
condensation is also observed. At the MDM resonances, transfer between angular
momenta in the magnetic insulator and in the vacuum cavity, demonstrates
generation of vortex flows with fixed handedness. This indicates unique
topological properties of polariton wavefronts. One observes curved wavefronts
and effects of supperradiance in microwave structures. In an environment of
scattering states of microwave waveguide, EM waves can carry the topological
phases of MDM resonances.
