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

Abstract

Anticrossing behavior between magnons in a non-collinear chiral magnet Cu${}_2$OSeO${}_3$ and a two-mode X-band microwave resonator was studied in the temperature range 5-100K. In the field-induced ferrimagnetic phase, we observed a strong coupling regime between magnons and two microwave cavity modes with a cooperativity reaching 3600. In the conical phase, cavity modes are dispersively coupled to a fundamental helimagnon mode, and we demonstrate that the magnetic phase diagram of Cu${}_2$OSeO${}_3$ can be reconstructed from the measurements of the cavity resonance frequency. In the helical phase, a hybridized state of a higher-order helimagnon mode and a cavity mode - a helimagnon polariton - was found. Our results reveal a new class of magnetic systems where strong coupling of microwave photons to non-trivial spin textures can be observed.

arXiv commentrevised version (including details on the mechanism of helimagnon-photon coupling), main text (5 pages, 3 figures) + supplemental materials (part 1 and part 2)

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• Tunable Cooperativity in Coupled Spin--Cavity Systems
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