Nonreciprocal high-order sidebands induced by magnon Kerr nonlinearity

We propose an effective approach for creating robust nonreciprocity of high-order sidebands, including the first-, second- and third-order at microwave frequencies. This relies on magnon Kerr nonlinearity in a cavity magnonics system composed two cavities one yttrium iron garnet (YIG) sphere. By manipulating driving power applied YIG frequency detuning between mode field, can be strengthened, thereby inducing strong transmission non-reciprocity. More interestingly, we find higher sideband order, stronger marked by isolation ratio optimal regime. Such series equally-spaced sidebands have potential applications comb-like precision measurement, besides structuring high-performance on-chip nonreciprocal devices.