| 简介 |
The rare earth sintered magnet according to the present embodiment includes a rare earth sintered magnet body including crystal grains of (R1, R2)2T14B (wherein R1 represents at least one rare earth element except for Dy and Tb, R2 represents a rare earth element at least including one or both of Dy and Tb, and T represents one or more transition metal elements including Fe or including Fe and Co). In the rare earth sintered magnet, the ratio of R2 to the sum of R1 and R2 that are contained in crystal grain boundaries surrounding the crystal grains in the rare earth sintered magnet body is higher than the ratio of R2 to the sum of R1 and R2 in the crystal grains, and the concentration of R2 increases from the central portion of the rare earth sintered magnet body toward the surface of the rare earth sintered magnet body. In addition, the degree of unevenness in residual magnetic flux density on the surface of the rare earth sintered magnet body is smaller than 3.0%. |
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