| 摘要 |
PROBLEM TO BE SOLVED: To provide a soft magnetic film which is suitable for a magnetic recording head magnetic core material and has Bs of 2.2 T or above at a room temperature and frequency dependency of superior permeability. SOLUTION: This magnetic core soft magnetic thin film has a composition represented by a formula, (Fe1- ACoA)100- X- Y- ZMXRYOZ, where M is Zr and/or Al, R denotes one or two elements selected from Ru, Pd, and Pt, O represents oxygen, compositional ratios A, X, Y and Z denote atomic ratios, and A, X, Y and Z are so set as to satisfy following formulas, 0.25<=A<=0.5, 1<=X<=3, 0<=Y<=1, and 6<=Z<=10. The soft magnetic thin film is formed of fine crystals where the (110) planes of body-centered cubic structures are preferentially oriented and which are 40 nm or below in grain diameters and has a saturation magnetization of 2.2 T or above.
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