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An aspect of the present invention relates to an iron nitride powder. The iron nitride powder is comprised chiefly of Fe16N2 and comprises, on at least a portion of the powder surface, a coating layer comprising at least one element selected from the group consisting of rare earth metal elements, aluminum, and silicon, and cobalt-containing ferrite having a composition denoted by (CoxFe1−x)Fe2O4, wherein 0
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