ALLOY USED IN SOFT-MAGNETIC THIN-FILM LAYER ON PERPENDICULAR MAGNETIC RECORDING MEDIUM, SPUTTERING-TARGET MATERIAL, AND PERPENDICULAR MAGNETIC RECORDING MEDIUM HAVING SOFT-MAGNETIC THIN-FILM LAYER

摘要

There is provided a soft magnetic alloy for a perpendicular magnetic recording medium, having a high saturation magnetic flux density at high temperature with respect to a saturation magnetic flux density at room temperature. The alloy comprises in at%: one or more of lanthanoid elements having an atomic number of 57 to 71; one or two or more of Y, Ti, Zr, Hf, V, Nb, Ta, and B or/and one or two or more C, Al, Si, P, Cr, Mn, Ni, Cu, Zn, Ga, Ge, Mo, Sn, and W; and the balance Co, Fe, and unavoidable impurities; and satisfies all of the following expression: (1) 0.5 ≤ TLA ≤ 15, (2) 5 ≤ TLA+TAM; and (3) TLA+TAM+TNM ≤ 30, (where TLA is a total percentage of an added amount of one or more of the lanthanoid elements, having an atomic number to 57 to 71; TAM equal to a total percentage of an added amount of Y+Ti+Zr+Hf+V+Nb+Ta+B/2, where, as for only B, a value of 1/2 thereof is used; and TNM equals to a total percentage of an added amount of C+Al+Si+P+Cr+Mn+Ni+Cu+Zn+Ga+Ge+Mo+Sn+W) Fig. 2