We predict magnon polariton states circulating unidirectionally in a microwave cavity when loaded by a number of magnets on special lines. Realistic finite-element numerical simulations, including dielectric, time-dependent and non-linear effects, confirm the validity of the approximations of a fully analytical input-output model. We find that a phased antenna array can focus all power into a coherent microwave beam with controlled direction and an intensity that scales with the number of magnets.
@article{arxiv.2006.02203,
title = {Circulating cavity magnon polaritons},
author = {Weichao Yu and Tao Yu and Gerrit E. W. Bauer},
journal= {arXiv preprint arXiv:2006.02203},
year = {2020}
}