METHOD OF PRODUCING SURFACE-MODIFIED RARE EARTH SINTERED MAGNET

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Disclosed is a method of producing a surface-modified rare earth sintered magnet with having excellent magnetic characteristics and having extreme corrosive resistance even in environments with fluctuating temperature and humidity. The disclosed method of producing a surface-modified rare earth sintered magnet involves a step for heat treating at 200°C to 600°C a rare earth sintered magnet in an atmosphere having an oxygen partial pressure of 1x103Pa to 1x105Pa, a water vapor partial pressure of 45Pa or less, and a ratio of oxygen partial pressure to water vapor partial pressure (oxygen partial pressure / water vapor partial pressure) of 450 to 20000.