Sumitomo Special Metals Co., Ltd.

Shigeru Takaki

Ken Makita

A compact is produced from an alloy powder for R&mdash;Fe&mdash;B type rare earth magnets including particles having a size in a range of about 2.0 &mgr;m to about 5.0 &mgr;m as measured by a light scattering method using a Fraunhofer forward scattering in a proportion of approximately 45 vol. % or more and particles having a size larger than about 10 &mgr;m in a proportion of less than about 1 vol. %. The compact is then sintered to obtain a R&mdash;Fe&mdash;B type rare earth magnet having an average crystal grain size in a range of about 5 &mgr;m to about 7.5 &mgr;m, and an oxygen concentration in a range of about 2.2 at. % to about 3.0 at. %.

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Amagasaki, Japan

Shigeru Takaki