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Experiments during the past two years have shown strong resonantphoton-magnon coupling in microwave cavities, while coupling in the opticalregime was demonstrated very recently for the first time. Unlike withmicrowaves, the coupling in optical cavities is parametric, akin tooptomechanical systems. This line of research promises to evolve into a newfield of optomagnonics, aimed at the coherent manipulation of elementarymagnetic excitations by optical means. In this work we derive the microscopicoptomagnonic Hamiltonian. In the linear regime the system reduces to thewell-known optomechanical case, with remarkably large coupling. Going beyondthat, we study the optically induced nonlinear classical dynamics of amacrospin. In the fast cavity regime we obtain an effective equation of motionfor the spin and show that the light field induces a dissipative termreminiscent of Gilbert damping. The induced dissipation coefficient however canchange sign on the Bloch sphere, giving rise to self-sustained oscillations.When the full dynamics of the system is considered, the system can enter achaotic regime by successive period doubling of the oscillations.

Coupled Spin-Light dynamics in Cavity Optomagnonics