R-FE-B SINTERED MAGNET AND MAKING METHOD

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The invention provides an R-Fe-B sintered magnet consisting essentially of 12-17 at% of R, 0.1-3 at% of M1, 0.05-0.5 at% of M2, 4.8+2*m to 5.9+2*m at% of B, and the balance of Fe, containing R2(Fe, (Co))14B intermetallic compound as a main phase, and having a core/shell structure that the main phase is covered with a HR-rich layer and a (R, HR)-Fe(Co)-M1 phase wherein HR is Tb, Dy or Ho. The sintered magnet exhibits a coercivity ≥ 10 kOe despite a low content of Dy, Tb, and Ho.