Patent ID: 8128760
Filing Date: 2012-03-06
Classification: H01F

Abstract:
1. A method of manufacturing a permanent magnet comprising: heating an iron-boron-rare earth based sintered magnet disposed in a processing chamber to a first predetermined temperature which is from 800° C. to 1050° C.; evaporating an evaporating material disposed in the processing chamber or another processing chamber, the evaporating material comprising a hydride containing at least one of Dy and Tb; causing the evaporated evaporating material to be adhered to a surface of the sintered magnet; and diffusing metal atoms of the at least one of Dy and Tb of the adhered evaporating material into a grain boundary phase of the sintered magnet, before a thin film made of the evaporated material is formed on the surface of the sintered magnet, wherein the evaporating and the diffusing are executed substantially simultaneously.