RARE EARTH-BASED PERMANENT MAGNET

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PROBLEM TO BE SOLVED : To provide a rare earth-based permanent magnet which allows an R-T-B-based sintered magnet to have a high coercive force by substituting part of R with a heavy rare earth element in the R-T-B-based sintered magnet. SOLUTION : A rare earth-based permanent magnet is composed of a sintered compact having main phases of R2T14B structure (where R represents at least one of rare earth elements including Y, T represents Fe or Fe partially substituted with Co, and B represents boron), and grain boundary phases including Ho-Y-N phase. In the sintered compact, the cross sectional percentage of Ho-Y-N phase to all of grain boundary phases per unit cross section is 2.0-60%. In the Ho-Y-N phase, the content of Ho is 5.0-80 at%, and the content of Y is 5.0-80 at%. SELECTED DRAWING : None COPYRIGHT : (C)2016, JPO&INPIT