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Light-matter interactions lie at the heart of condensed matter physics,providing physical insight into material behaviour while enabling the design ofnew devices. Perhaps this is most evident in the push to develop quantuminformation and spintronic technologies. On the side of quantum information,engineered light-matter interactions offer a powerful means to access andcontrol quantum states, while at the same time new insights into spin-photonmanipulation will benefit the development of spintronic technologies. In thiscontext the recent discovery of hybridization between ferromagnets and cavityphotons has ushered in a new era of light-matter exploration at the crossroadsof quantum information and spintronics. The key player in this rapidlydeveloping field of cavity spintronics is a quasiparticle, thecavity-magnon-polariton. In this early review of recent work, the fundamentalbehaviour of the cavity-magnon-polariton is summarized and related to thedevelopment of new spintronic applications. In the last few years acomprehensive theoretical framework of spin-photon hybridization has beendeveloped. On an intuitive level many features can be described by a model ofcoupled oscillators, however the origin of hybridization is only revealed byconsidering a comprehensive electrodynamic framework. Here both approaches aresummarized and a quantum description using the input-output formalism isoutlined. Based on this foundation, in depth experimental investigations of thecoupled spin-photon system have been performed. For example, the influence ofhybridization on spin current generation has been revealed and several in-situcoupling control mechanisms have been developed. The many recent developmentswithin this field represent only the first steps in what appears to be a brightfuture for cavity spintronics.

Cavity Spintronics: An Early Review of Recent Progress in the Study of Magnon-Photon Level Repulsion