Patent ID: 8163106
Filing Date: 2012-04-24
Classification: C23C,H01F,Y10T

Abstract:
1. An R—Fe—B based sintered magnet having on its surface a vapor deposited film of aluminum or an alloy thereof, characterized in that the vapor deposited film of aluminum or an alloy thereof comprises a columnar crystalline structure grown broader from the surface of the R—Fe—B based sintered magnet outward to an outer surface of the vapor deposited film aluminum or an alloy thereof, wherein the vapor deposited film of aluminum or an alloy thereof has a part within a region defined in the thickness direction of the film as taken from the surface of the bulk magnet body to ⅓ of the film thickness, the part having 5 to 30 intercrystalline gaps of 0.01 μm to 1 μm in width as counted per 10 μm length in the lateral direction of the film.