The Dy free and Dy substituted (0 100) Nd Fe B sintered magnets based on the NEOMAX 50 type magnet were prepared, and the magnetic properties such as the saturation magnetizations, the coercivities and the magnetic anisotropy constants (K 1 , K 2 ) were determined by the obtained data using an high field magnetometer. The domain structures, especially domain widths were measured using MOKE and SEM, and the sizes of magnetic interacted regions were calculated based on the resulted values. The coercivity of the magnets is subjected to, first: the magnetic anisotropy field, second: crystal grain sizes, third: size of group of crystal grains behaving as a cooperated region that reflects the magnetic interaction through the grain boundary (GB).
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