Magnet

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A rare earth magnet or a method of making a rare earth magnet, comprises cold spraying the surface of a rare earth magnet body 2 with dysprosium. The dysprosium may form a layer 3 with a thickness between 1 to 5 µm. The magnet may be formed of a sintered rare earth alloy with a grain structure 4. The sprayed magnet may be subjected to a heat treatment which induces a grain boundary diffusion process for the dysprosium layer 3 to form shell layers 5 around one or more grains 4. The magnet may include a neodymium alloy, such as Nd2Fe14B.