Mechanical Bistability in Kerr-modified Cavity Magnomechanics

• URL: http://arxiv.org/abs/2206.14588v2
• Date: Sat, 3 Sep 2022 08:05:34 GMT
• Title: Mechanical Bistability in Kerr-modified Cavity Magnomechanics
• Authors: Rui-Chang Shen, Jie Li, Zhi-Yuan Fan, Yi-Pu Wang, J. Q. You
• Abstract summary: Bistable mechanical vibration is observed in a cavity magnomechanical system. Bistability manifests itself in both the mechanical frequency and linewidth under a strong microwave drive field.
• Score: 7.298195012362328
• License: http://creativecommons.org/publicdomain/zero/1.0/
• Abstract: Bistable mechanical vibration is observed in a cavity magnomechanical system, which consists of a microwave cavity mode, a magnon mode, and a mechanical vibration mode of a ferrimagnetic yttrium-iron-garnet (YIG) sphere. The bistability manifests itself in both the mechanical frequency and linewidth under a strong microwave drive field, which simultaneously activates three different kinds of nonlinearities, namely, magnetostriction, magnon self-Kerr, and magnon-phonon cross-Kerr nonlinearities. The magnon-phonon cross-Kerr nonlinearity is first predicted and measured in magnomechanics. The system enters a regime where Kerr-type nonlinearities strongly modify the conventional cavity magnomechanics that possesses only a radiation-pressure-like magnomechanical coupling. Three different kinds of nonlinearities are identified and distinguished in the experiment. Our work demonstrates a new mechanism for achieving mechanical bistability by combining magnetostriction and Kerr-type nonlinearities, and indicates that such Kerr-modified cavity magnomechanics provides a unique platform for studying many distinct nonlinearities in a single experiment.

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