Method for Modifying Grain Boundary of Nd-Fe-B Base Magnet, and Body with Modified Grain Boundary T

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An improvement of coercive force of Nd—Fe—B base sintered magnet can be realized while suppressing a decrease in remanent magnetic flux density to the minimum using a method for modifying grain boundary which comprises heat-treating an Nd—Fe—B base magnet with a specific alloy disposed on its surface, the alloy having the following Formula 1 : [in-line-formulae]RxAyBz  (1)[/in-line-formulae] wherein R represents at least one rare earth element including Sc and Y, A represents Ca or Li, B represents an unavoidable impurity, and 2≤x≤99, 1≤y

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