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Anticrossing behavior between magnons in a non-collinear chiral magnetCu$_2$OSeO$_3$ and a two-mode X-band microwave resonator was studied in thetemperature range 5-100K. In the field-induced ferrimagnetic phase, we observeda strong coupling regime between magnons and two microwave cavity modes with acooperativity reaching 3600. In the conical phase, cavity modes aredispersively coupled to a fundamental helimagnon mode, and we demonstrate thatthe magnetic phase diagram of Cu$_2$OSeO$_3$ can be reconstructed from themeasurements of the cavity resonance frequency. In the helical phase, ahybridized state of a higher-order helimagnon mode and a cavity mode - ahelimagnon polariton - was found. Our results reveal a new class of magneticsystems where strong coupling of microwave photons to non-trivial spin texturescan be observed.

Magnon-photon coupling in a non-collinear magnetic insulator Cu$_2$OSeO$_3$