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Fe3B-based Nd-Fe-B permanent magnet materials containing Co and M as additives (M=Al, Si, Cu, Ga, Ag, Au) were prepared in an extremely low rare-earth concentration range centered on 4 at%. The hard magnetic properties develop as a result of heat treatment of rapidly solidified amorphous ribbons, which produces a metastable nanocrystalline structure consisting of Fe3B and Nd2Fe14B. Use of the additives...
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