R-T-B BASED PERMANENT MAGNET AND METHOD FOR MANUFACTURING SAME

An R-T-B-based permanent magnet having improved magnetic properties contains R that represents at least one rare earth element essentially including Nd or Pr, T that represents at least one iron-group element essentially including Fe, B that represents boron, and M that represents at least one element selected from Ga, Al, Cu and Si. The R-T-B-based permanent magnet includes main-phase grains which include R2T14B crystals and two-grain grain boundaries each of which exists between adjacent two of the main-phase grains. The average thickness of the two-grain grain boundaries is 5 to 50 nm inclusive. The area ratio of an R6T13M compound in an arbitrary cross section is 0.50% or less (including 0%).