We theoretically study the effects of magnonic Kerr nonlinearity on magnon-polaritons (MPs) with a soft-mode in easy-axis ferromagnets coupled to a microwave cavity. Using an effective circuit model capable of describing MPs up to the nonperturbative strong-coupling regime, we show that chaotic and frequency-comb-like behaviors of MPs emerge at the original modes crossing point. Furthermore, we demonstrate that the Kerr nonlinearity induces a finite excitation gap in the soft-mode, particularly in the strong-coupling regime.
@article{arxiv.2602.12550,
title = {Effects of magnonic Kerr nonlinearity on magnon-polaritons with a soft-mode},
author = {Takahiro Chiba},
journal= {arXiv preprint arXiv:2602.12550},
year = {2026}
}