A single-molecule magnet is – true to its name – a magnet composed of a single molecule. The magnetic moment of such a molecule shows hysteresis like a classical magnet, yet it can tunnel between different orientation states. I will review some of the basic properties of this interesting class of materials and, in particular, their interaction with microwave radiation, which can induce coherent phenomena such as Rabi oscillations and collective coupling of an ensemble of these magnets to a resonant mode of a cavity (vacuum Rabi splitting). I will also discuss the prospects for using these systems for storage and processing of classical and quantum information.
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