2021
DOI: 10.48550/arxiv.2111.08376
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Optical sensing of magnons via the magnetoelastic displacement

Zhi-Yuan Fan,
Rui-Chang Shen,
Yi-Pu Wang
et al.

Abstract: We show how to measure a steady-state magnon population in a magnetostatic mode of a ferrimagnet, such as yttrium iron garnet. We adopt an optomechanical approach and utilize the magnetoelasticity of the ferrimagnet. The magnetostrictive force dispersively couples magnons to the deformation displacement of the ferrimagnet, which is proportional to the magnon population. By further coupling the mechanical displacement to an optical cavity that is resonantly driven by a weak laser, the magnetostrictively induced… Show more

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