To provide an R-T-B sintered magnet of high performance, having a thin film shape, a thin-walled shape, or radial anisotropy with an enhanced degree of orientation, in comparison with the conventional magnets.
When the sum total of main contents of R, T, and B (R is at least one of rare earth elements including Y and T is Fe or Fe and Co) is 100% by weight %, the arc segment magnet comprises the sintered magnet, where R is 28-33%, B is 0.8-1.5%, and T is the rest, is characterized in that a quantity of oxygen contained inevitability in with respect to the total weight of the arc segment magnet is equal to or less than 0.3%, the thickness of the arc segment magnet has a thin-film shape of 1-4 mm, the density is higher than 7.56 Mg/m3 (g/cm3), and at room temperature, coercive force iHc is equal to or more than 1.1 MA/m (14 kOe) and the degree of orientation (Br/4πImax) in a given anisotropy direction is equal to or higher than 96%.
UCHIDA KIMIO
ODA KAZUO
MIKAMOTO TSUKASA
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