Patent ID: 7485193

Claim:
A R—Fe—B base rare earth permanent magnet material consisting of, in percents by weight, R 25 to 45 wt %, Co 0.1 to 4.5 wt %, B 0.8 to 1.4 wt %, Al 0.05 to 3.0 wt %, Cu 0.02 to 0.5 wt %, M 0.03 to 0.5 wt %, C 0.01 to 0.5 wt %, O 0.05 to 3.0 wt %, N 0.002 to 0.1 wt %, F 0.001 to 2.0 wt %, with the balance of Fe and incidental impurities, wherein R is at least one element selected from the group consisting of Nd, Pr, Dy, Tb and Ho, and M is at least one element selected from the group consisting of Zr, Hf, Ti, Nb, Mo, Si, Sn, Zn, V, W and Cr, said magnet material comprising a R—O—F compound which is localized at triple points in the magnet.