Magnon-Induced Nonreciprocity Based on the Magnon Kerr Effect

While nonreciprocal devices such as light isolators and circulators are becoming indispensable components in classical and quantum information processing, nonreciprocity in cavity magnon systems, which offer distinct advantages, still needs investigation. This study proposes an intrinsically tunable two-cavity magnon system that can achieve nonreciprocal light transmission, based on the magnon Kerr effect. By adjusting the external magnetic field, even one-way transmission can be obtained. These results point the way to microscale magnonic structures for potential applications in light diodes, on-chip light control, and optical communication.