Magnetic powder containing Sm—Fe—N-based crystal particles, sintered magnet produced from same, method for producing said magnetic powder, and method for producing said sintered magnet

A sintered magnet comprising:

• a crystal phase composed of a plurality of Sm—Fe—N-based crystal grains;
• and
• a nonmagnetic metal phase present between the Sm—Fe—N-based crystal grains adjacent to each other,
• wherein a ratio of Fe peak intensity IFe to SmFeN peak intensity ISmFeN measured by an X-ray diffraction method is 0.2 or less,
• wherein the nonmagnetic metal phase covers surfaces of the Sm—Fe—N-based crystal grains,
• wherein the nonmagnetic metal phase comprises at least one metal selected from the group consisting of Al, Cu, Ti, Sm, Mo, Ru, Ta, W, Ce, La, V, Mn, and Zr,
• wherein the sintered magnet has coercivity of 10.6 kOe or more,
• wherein the sintered magnet has saturation magnetization of 10.1 kG or more, and
• wherein the nonmagnetic metal phase is present in contact with the crystal grain boundary at a ratio of 80% or more in a line length on the crystal grain boundary of the Sm—Fe—N-based crystal grains.