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Abstract

An Sm—Fe—N-based magnetic powder includes particles containing Sm, Fe, and N as main components. The powder has a composition wherein a molar ratio of Sm to Fe (Sm/Fe) is 0.09 or more and 0.25 or less, a molar ratio of N to Fe (N/Fe) is 0.06 or more and 0.30 or less, and a Ca content in the powder is 0.002 mass % or less. When a cumulative 10% particle diameter is represented by D10, a cumulative 50% particle diameter is represented by D50, and a cumulative 90% particle diameter is represented by D90 in a volume-based particle size distribution according to a laser diffraction/scattering method, D50 is 2.0 to 11.0 μm, and D10, D50, and D90 satisfy a relationship of the following formula: (D90−D10)/D50<1.10. The Sm—Fe—N-based magnetic powder is advantageous in improving coercive force, containing few impurities, and improving the performance and manufacturability of a bonded magnet.

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First Claim