SURFACE MULTIPOLAR ANISOTROPIC RING MAGNET

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PROBLEM TO BE SOLVED : To provide a surface multipolar anisotropic ring-shaped magnet which has high circularity and is inexpensive. SOLUTION : The surface multipolar anisotropic ring magnet consists of an R-T-B system sintered body (R is at least one kind of rare earth elements comprising Y, T is Fe, or Fe and Co) and satisfies formula I : (D2-D 1 )/2 8.