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We propose a platform that combines the fields of cavity optomagnonics andlevitated optomechanics in order to control and probe the coupledspin-mechanics of magnetic dielectric particles. We theoretically study thedynamics of a levitated Faraday-active dielectric microsphere serving as anoptomagnonic cavity, placed in an external magnetic field and driven by anexternal laser. We find that the optically driven magnetization dynamicsinduces angular oscillations of the particle with low associated damping.Further, we show that the magnetization and angular motion dynamics can beprobed via the power spectrum of the outgoing light. Namely, the characteristicfrequencies attributed to the angular oscillations and the spin dynamics areimprinted in the light spectrum by two main resonance peaks. Additionally, wedemonstrate that a ferromagnetic resonance setup with an oscillatoryperpendicular magnetic field can enhance the resonance peak corresponding tothe spin oscillations and induce fast rotations of the particle around itsanisotropy axis.

Optical signatures of the coupled spin-mechanics of a levitated magnetic microparticle