R-T-B-BASED RARE EARTH PERMANENT MAGNET

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PROBLEM TO BE SOLVED : To provide an R-T-B-based rare earth permanent magnet that obtains a higher magnetization rate by a low magnetization magnetic field and allows the magnetization rate to rise fast until a magnetization rate reaches the vicinity of 100%, for example about 90%. SOLUTION : In the R-T-B-based rare earth permanent magnet having a high coercive force by containing many heavy rare earth elements, the average crystal particle diameter of a sintered body and the amount of contained oxygen are controlled, and further an element such as Nb is contained. Regarding magnetization characteristics, the calculation result of (f1/f3×100) is equal to or higher than 60%, and the result of (f2/f3×100) is equal to or higher than 85%, when total flux by applying an effective magnetic field of 240 kA/m is set to f1, when total flux by applying an effective magnetic field of 400 kA/m is set to f2, and when total flux by applying an effective magnetic field of 2, 000 kA/m is set to f3 if Pc is equal to 2.