Rare earth magnetic alloys, their manufacturing methods, rare earth magnets, rotors and rotors

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A rare earth magnet alloy having a tetragonal R2Fe14B crystalline structure and having : a main phase having at least one type selected from the group consisting of Nd, La, and Sm, Fe, and B as the main constituent elements thereof; and an auxiliary phase having at least one type selected from the group consisting of Nd, La, and Sm and O as the main constituent element thereof. La is substituted at at least either an Nd(f) site or an Nd(g) site. Sm is substituted at at least either an Nd(f) site or an Nd(g) site. La is segregated in the auxiliary phase and Sm is dispersed without segregation, into the main phase and the auxiliary phase.