R-T-CU-MN-B TYPE SINTERED MAGNET

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Disclosed is an R-T-Cu-Mn-B type sintered magnet comprising the following components : R : 12.0 to 15.0 at.% (inclusive) [wherein R represents a rare earth element including Y, provided that Pr and/or Nd makes up 50 at.% or more of the total quantity of R], B : 5.5 to 6.5 at.% (inclusive), Cu : 0.08 to 0.35 at.% (inclusive), Mn : not less than 0.04 at.% and less than 0.2 at.%, M : not more than 2 at.% (including 0 at.%) [wherein M represents at least one element selected from Al, Ti, V, Cr, Ni, Zn, Ga, Zr, Nb, Mo, Ag, In, Sn, Hf, Ta, W, Au, Pb and Bi], and T : the remainder [wherein T comprises Fe alone or both Fe and Co, provided that Co makes up 20 at.% or less of the total quantity of T when T comprises both Fe and Co].