METHOD FOR MANUFACTURING HARD MAGNETIC COMPOSITION

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PROBLEM TO BE SOLVED : To provide a method for manufacturing a hard magnetic composition which contains a ThMn12 type crystal phase and has high magnetic properties. SOLUTION : The manufacturing method comprises preparing an alloy material containing the ThMn12 type crystal phase, and heating and keeping the alloy material under a pressurized atmosphere containing N to nitride it. The alloy material preferably has a chemical composition which is expressed by the general formula : R11-xR2x(TiyFe100-y-wCow)zSiu, (wherein R1 is one or two elements of rare earth elements including Y, while Nd occupies 50% or more of R1; and R2 is one or two elements of Zr and Hf), and has such molar ratios of the general formula as to make x into 0.18 or less, y into 5 to 12.3, z into 11 to 12.8, u into 0.1 to 2.3, w into 0 to 30, and (the total of each molar ratio of Fe + Co +Ti + Si) / (the total of each molar ratio of R1 + R2) larger than 12. The pressure in the pressurized atmosphere is preferably controlled to 0.15 to 5.0 MPa.