Anisotropic rare earth sintered magnet and method for producing same

An anisotropic rare earth sintered magnet represented by the formula (R1-aZra)x(Fe1-bCob)100-x-y(M11-cM2c)y (wherein R is a combination of Sm and one or more elements selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu;

• M1 is at least one element selected from the group consisting of V, Cr, Mn, Ni, Cu, Zn, Ga, Al, and Si;
• M2 is at least one element selected from the group consisting of Ti, Nb, Mo, Hf, Ta, and W;
• x, y, a, b, and c each satisfy 7≤x≤15 at %, 4≤y≤20 at %, 0≤a≤0.2, 0≤b≤0.5, and 0≤c≤0.9), the magnet comprising 80% by volume or more of a main phase composed of a compound of a ThMn12 type crystal and containing an R-rich phase and an R(Fe,Co)2 phase in a grain boundary portion, the main phase having an average crystal grain size of 1 μm or more, an intergranular grain boundary phase being formed between adjacent main phase grains and a Sm/R ratio in an inner portion of the main phase grain being lower than Sm/R ratios of the R-rich phase and the R(Fe,Co)2 phase.