METHOD OF MAKING RARE EARTH PERMANENT MAGNET WITH EXCELLENT MAGNETIC PROPERTY

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Disclosed is a method of manufacturing a rare earth permanent magnet with substantially improved magnetic property. The method comprises : preparing a magnet master alloy by melting an R-T-B based alloy; pulverizing the magnet master alloy to provide a magnet powder; pressurizing the magnet powder as applying magnetic field to the magnet powder under an inert atmosphere to form a magnet molded body; sintering the magnet molded body under a vacuum atmosphere to obtain a sintered magnet molded body having oxygen content of about 0.1 wt % or less based on the total weight of the sintered magnet molded body; and treating the sintered magnet molded body with Dy and Tb.