Patent ID: 8425695
Filing Date: 2013-04-23
Classification: H01F

Abstract:
1. A rare earth sintered magnet comprising: a main phase that includes an R a grain boundary phase in which a content of R is larger than a content of the R a grain boundary triple point that is surrounded by three or more main phases, wherein the grain boundary triple point includes an R-rich phase containing R of 90 at % or more, and an R75 phase containing R of 60 at % to 90 at %, Co, and Cu, 0.05≦(Co+Cu)/R<0.45 is satisfied where (Co+Cu)/R is a composition ratio of R, Co, and Cu contained in the R75 phase in terms of atomic percentage, and an area where a Co-rich region overlaps with a Cu-rich region in a cross-sectional area of the grain boundary triple point on a cross section of the rare earth sintered magnet is 60% or more.