Patent ID: 6916385

Claim:
A method of manufacturing a magnetic material comprising: colliding a molten alloy to a circumferential surface of a cooling roll to cool and then solidify the molten alloy; and producing a ribbon-shaped magnetic material having an alloy composition represented by the formula of R x (Fe 1−y Co y ) 100−x−z B z (where R is at least one rare-earth element, X is 10-15 at %, y is 0-0.30, and z is 4-10 at %); and expelling gas entered between the circumferential surface of the cooling roll and a puddle of the molten alloy, wherein gas expelling means on the circumferential surface of the cooling roll are defined by at least one groove with an average width of 0.5-90 μm to prevent the molten alloy from entering the at least one groove, and the groove is formed spirally with respect to the rotation axis of the cooling roll.