Bistability in dissipatively coupled cavity magnonics

Abstract

Dissipative coupling of resonators arising from their cooperative dampings to a common reservoir induces intriguingly new physics such as energy level attraction. In this study, we report the nonlinear properties in a dissipatively coupled cavity magnonic system. A magnetic material YIG (yttrium iron garnet) is placed at the magnetic field node of a Fabry-Perot-like microwave cavity such that the magnons and cavity photons are dissipatively coupled. Under high power excitation, a nonlinear effect is observed in the transmission spectra, showing bistable behaviors. The observed bistabilities are manifested as clockwise, counterclockwise, and butterfly-like hysteresis loops with different frequency detuning. The experimental results are well explained as a Duffing oscillator dissipatively coupled with a harmonic one and the required trigger condition for bistability could be determined quantitatively by the coupled oscillator model. Our results demonstrate that the magnon damping has been suppressed by the dissipative interaction, which thereby reduces the threshold for conventional magnon Kerr bistability. This work sheds light upon potential applications in developing low power nonlinearity devices, enhanced anharmonicity sensors and for exploring the non-Hermitian physics of cavity magnonics in the nonlinear regime.

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Cited by in corpus (5)

• Magnon-Skyrmion Hybrid Quantum Systems: Tailoring Interactions via Magnons
• Magnomechanical backaction corrections due to coupling to higher order Walker modes and Kerr nonlinearities
• Kerr Nonlinearity Induced Nonreciprocity in dissipatively coupled resonators
• Entanglement properties of photon-magnon crystal from nonlinear perspective
• Explosive growth of bistability in a cavity magnonic system