A nanomagnet is a submicrometric system that presents spontaneous magnetic order at zero applied magnetic field. The small size of nanomagnets prevents the formation of magnetic domains. The magnetization dynamics of sufficiently small nanomagnets at low temperatures, typically single-molecule magnets, presents quantum phenomena, such as macroscopic spin tunnelling. At larger temperatures, the magnetization undergoes random thermal fluctuations which present a limit for the use of nanomagnets for permanent information storage.

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