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Due to the limited rare-earth elements resources, ferrite magnets need to beimproved drastically. Ideally, for a true hard magnet, the coercive fieldshould be larger than the saturation magnetization, which is not yet realizedfor ferrites. Thus, an alternative can be found in making very fine grainferrite magnets, but it is usually impossible to get small grains and densematerial together. In this paper, it is shown that the spark plasma sinteringmethod is able to produce approximately 80% of dense material with crystallitessmaller than 100 nm. The as-prepared bulk sintered anisotropic magnets exhibitscoercive field of 0.5 T which is approximately 60% of the theoretical limit andonly a few percentage below that of loose nanopowders. As a result, the magnetsbehave nearly ideal (-1.18 slope in the BH plane second quadrant) and theenergy product reaches 8.8 kJ m-3, the highest value achieved in the isotropicferrite magnet to our knowledge.

Giant coercivity of dense nanostructured spark plasma sintered barium hexaferrite