Nonlinear effects are prevalent in nature, and the nonlinearity gives our world its vibrant hues and enables us to build information technologies. We can edit, manipulate, convert, and store data by using nonlinear devices. All of these activities necessitate the use of an effective information manipulation platform or system.

Cavity magnonics is a new field of solid-state quantum information science based on coherently or dissipatively coupled cavity photons and collective spin excitations (magnons) in a ferromagnetic spin ensemble. Due to the flexible adjustability of the cavity magnonic system, it offers exceptional advantages in fundamental and applied research. Among them, the Kerr nonlinear effect of the magnon mode induced by magnetocrystalline anisotropy has gradually been developed in this system, resulting in bistability, multistability, nonreciprocal effect, and logic devices.

In this recent work, Liu and coauthors utilize the Kerr nonlinearity of the magnon mode to enhance the generation efficiency of optical second-order sidebands in the cavity magnonic system. In both weak and strong coupling regimes, the enhanced efficiency can be observed. Based on this work, more studies will be stimulated in the development of nonlinear devices based on magnon Kerr nonlinearity and solid-state spin ensemble.

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