Patent ID: 8262808

Claim:
A method of manufacturing a permanent magnet comprising: manufacturing an iron-boron-rare-earth based sintered magnet by: mixing a first powder and a second powder in a predetermined mixing ratio into a mixed powder, the first powder comprising a principal phase alloy including an R 2 T 14 B phase, where R is at least one rare earth element including Nd and where T is a transition metal including Fe, and the second powder comprising a liquid phase alloy including a higher content of R than the R 2 T 14 B phase of the first powder and a R-rich phase; press-forming the mixed powder oriented in a magnetic field into a press-formed body; and sintering the press-formed body in one of vacuum and inert gas atmosphere providing the manufactured sintered magnet and an evaporating material disposed at a distance from each other; providing, through a vapor atmosphere, the evaporating material comprising at least one of Dy and Tb to at least part of a surface of the sintered magnet; and diffusing, through heat-treatment at a first predetermined temperature, the at least one of Dy and Tb adhered to at least part of the surface of the sintered magnet into a grain boundary phase of the sintered magnet, before a thin film made of the evaporating material is formed on the at least part of the surface of the sintered magnet.