A map of cavity magnonics: concepts, developments, and recent advances

Recent developments in the field of cavity magnonics are surveyed with a focus on emerging topics of particular interest for application to information technologies. The review begins with a brief tutorial, providing a conceptual foundation useful for understanding cavity magnon-polaritons. More detailed discussions follow that target directions that have received increasing attention in recent years. These topics include remote and long-distance coupling, topological magnonics, non-reciprocity, and explorations of these phenomena for quantum and single magnon regimes. Interest in this area is driven in large part by a combination of modern nano-fabrication techniques with microwave active materials in order to engineer new functionality and phenomena in forms useful for application across a range of classical and quantum technologies. Moreover, advances in the ability to control the coupling between photons and cavity magnons is creating an exciting playground within which to explore new physics enabled by precision studies of cavity magnon-polaritons. From an applications perspective, these studies are also important for information technologies due to a great potential to store, transfer, and manipulate information encoded in spin states, thereby offering unique advantages as platforms for power-efficient classical and quantum computing.