Generation of Circulating Cavity Magnon Polaritons

In a circulating cavity magnon polariton (quantized spin wave plus photon, resonating in microwave chamber), the hybrid state and noninteracting photonic rotate opposite directions---an important phenomenon for generating chiral states of electromagnetic modes magnonics engineering, to impart angular momentum upon standing waves. This study demonstrates unidirectional nature mode propagation, paving way generation high-power beam with high coherence narrow bandwidth. The authors also demonstrate how propagation results nonreciprocity mode's transmission amplitudes phases.