| abstract |
A rare earth magnet having excellent corrosion resistance is provided. It has a magnet body ( 10 ) containing a rare earth element, and a protective film ( 20 ) formed on the magnet body ( 10 ). In the protective film ( 20 ), a first protective film ( 21 ), a second protective film ( 22 ) and a third protective film ( 23 ) are laminated in this order from the side of the magnet body ( 10 ). These are in a polycrystalline state and composed of a metal plated film, for example. The first protective film ( 21 ) and the third protective film ( 23 ) have a smaller mean crystal grain size than that of the second protective film ( 22 ). Microcrystallization of the first protective film ( 21 ) can improve the density of the interface between the protective film ( 20 ) and the magnet body ( 10 ), and decrease the number of pinholes. |