Patent ID: 7314531

Claim:
An R-T-B system rare earth permanent magnet, comprising a sintered body comprising: a main phase consisting of 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); and a grain boundary phase containing a higher total amount of R than said main phase, wherein a platy or acicular product exists, and wherein said sintered body has a composition consisting essentially of 28% to 33% by weight of R, 0.5% to 1.5% by weight of B, 0.03% to 0.3% by weight of Al, 0.3 or less by weight (excluding 0) of Cu, 0.05% to 0.2% by weight of Zr, 4% or less by weight (excluding 0) of Co, and the balance substantially being Fe.