| 简介 |
PROBLEM TO BE SOLVED : To provide a rare earth magnet with excellent corrosion resistance.
SOLUTION : A rare earth magnet 100 is an R-T-B based rare earth magnet containing a rare earth element R, a transition metal element T, and boron B, and further Cu and Co. Cu concentration distribution in the rare earth magnet has a gradient along a direction toward an inside from the surface of the rare earth magnet, and Cu concentration on the surface side of the rare earth magnet is higher than Cu concentration on the inner side of the rare earth magnet. Co concentration distribution in the rare earth magnet has a gradient along the direction toward the inside from the surface of the rare earth magnet, and Co concentration on the surface side of the rare earth magnet is higher than Co concentration on the inner side of the rare earth magnet.
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