A rotary machine and method of manufacturing the same and a rare earth permanent magnet

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PROBLEM TO BE SOLVED : To provide a rare earth permanent magnet which can minimize a reduction in the volume of an R-M-B based sintered magnet (R being one, two or more selected from rare earth elements including Y and Sc, M being Fe or a transition metal containing Fe and Co as its main components), and can effectively reduce an eddy current by forming a slit in the magnet, and also to provide a method of manufacturing the permanent magnet and a rotating machine. SOLUTION : The rare earth permanent magnet comprises a sintered joint obtained by integrally joining a plurality of single magnets made of an R1-M-B based composition (R1being one, two or more selected from rare earth elements including Y and Sc, M being Fe or a transition metal containing Fe and Co as its main components). The sintered joint has a slit passed therethrough from its one surface to another surface. An R2oxide layer (R2being one, two or more selected from rare earth elements including Y and Sc) is formed on the respective surfaces of the slit. COPYRIGHT : (C)2008, JPO&INPIT