Rare earth permanent magnet, making method, and permanent magnet rotary machine

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A rare earth permanent magnet is prepared from a sintered magnet body of a R 1 -Fe-B composition wherein R 1 is a rare earth element inclusive of Y and Sc, by forming a plurality of slits in a surface of the magnet body, disposing a powder on the magnet body surface, the powder comprising an oxide of R 2 , a fluoride of R 3 , or an oxyfluoride of R 4 wherein each of R 2 , R 3 , and R 4 is a rare earth element, and heat treating the magnet body and the powder below the sintering temperature in vacuum or in an inert gas.