Patent ID: 8075954

Claim:
A method for manufacturing a permanent magnet, the method comprising the steps of: coating a vaporizable metallic material including at least one of Dy and Tb onto a surface of a magnet of Fe—B-rare earth elements having a predetermined configuration; and diffusing the vaporizable metallic material coated onto the surface of the magnet into crystal grain boundary phases of the magnet by heat treating the vaporizable metallic material at a first predetermined temperature, wherein the coating step comprises: a first step for heating a process chamber to the first predetermined temperature used for carrying out the coating step and generating metallic vapor atmosphere within the process chamber by vaporizing the vaporizable metallic material previously arranged within the process chamber; and a second step for introducing into the process chamber the magnet held at a second predetermined temperature that is lower than the first predetermined temperature within the process chamber and selectively depositing the vaporizable metallic material onto the surface of the magnet by an effect of a temperature difference between the first predetermined temperature within the process chamber and the second predetermined temperature of the magnet until the magnet heats up and reaches a third predetermined temperature.