Patent ID: 7199690

Claim:
An R-T-B system rare earth permanent magnet, which comprises a sintered body comprising: an R 2 T 14 B phase (wherein R represents one or more rare earth elements (providing that the rare earth elements include Y) and T represents one or more transition metal elements essentially containing Fe, or Fe and Co) as a main phase; and a grain boundary phase containing a higher amount of R than said main phase, wherein, when Pc (permeance coefficient) is 2, if a total flux is defined as f 1 under the application of an effective magnetic field of 240 kA/m (providing that an effective magnetic field=an applied magnetic field−a demagnetizing field, and each value of them is absolute value), if a total flux is defined as f 2 under the application of an effective magnetic field, of 800 kA/m, and if a total flux is defined as f 3 under the application of an effective magnetic field of 2000 kA/m, a magnetization rate a (=f 1 /f 3 ×100) is 40% or more, and a magnetization rate b (=f 2 /f 3 ×100) is 90% or more.