| 简介 |
PROBLEM TO BE SOLVED : To solve the problem that a prior art anisotropic ring magnet having crystalline grains oriented in a specific direction by subjecting the magnet to hot plastic working has a coercive force insufficient for use in applications such as motor.
SOLUTION : An iron-boron-rare-earth-based magnet S having a magnetic anisotropy applied by subjecting the magnet to hot plastic working is located and heated in a processing chamber 20, an evaporation material V located in the same or another processing chamber and containing at least one of Dy and Tb is heated to be evaporated, the amount of metallic atoms of evaporated Dy or Tb supplied onto the surface of the magnet is adjusted to deposit Dy or Tb atoms on the magnet surface, and the deposited metallic atoms are diffused into a crystalline grain boundary phase prior to formation of a thin film made of the evaporated material on the magnet surface.
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