Magnons in Photonic Cavities and Resonators

The interaction between magnon and photons in cavities has attracted much attention in the past few years. The material of choice is the electrically insulating ferrimagnetic insulator yttrium iron garnet with exceptional high magnetic quality. The interest has, on one hand, been focused on (infrared) light scattering in monolithic YIG spheres that act as spherical optical resonators. On the other hand, both YIG spheres and films have been loaded into microwave cavities, from which the magnetization dynamics could be read-out by microwave transmission/reflection spectra or, electrically, with heavy metal contacts. In this talk I will report our theoretical efforts to understand experimental results and predict new effects in both research areas, both published [1–4] and unpublished.