Sintered magnet

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PROBLEM TO BE SOLVED : To provide a sintered magnet reducing the usage amount of rare earth elements of a rare earth magnet and satisfying an increase of maximum energy product and coercive force. SOLUTION : In a sintered magnet in which NdFeB based crystals and FeCo based crystals are present via a grain boundary, Co concentration decreases from a central part to a periphery within the FeCo based crystals, Co concentrations at the central part and the periphery within the FeCo based crystals have a difference by 2 atom% or more, and Co and heavy rare earth elements are unevenly distributed in the vicinity of the grain boundary within the NdFeB based crystals. COPYRIGHT : (C)2013, JPO&INPIT