| 摘要 |
PURPOSE:To prevent generation of cracks and exfoliation by forming an underlying film of a nonmagnetic or weakly magnetic alloy film consisting of 30-70wt% Cr and the balance Fe. CONSTITUTION:The underlying film is formed of the nonmagnetic or weakly magnetic alloy film consisting of 30-70wt% Cr and the balance Fe. Cr is incorporated therein more preferably at 35-60wt% and further preferably at 38-50wt%. The addition of Cu, Mn, Ru, Mo, W, etc., alone or in combination in order to form the more perfectly nonmagnetic underlying film and the addition of Co, Cu, Ni, Mn, Ru, Mo, W, etc., alone or in combination in order to improve the toughness, corrosion resistance, strength, etc., of the underlying film are possible as the elements to be added to the Fe-Cr alloy forming the underlying film. These additive elements are required to be confined to <=30wt% in total. The strength of the medium is thereby stabilized and the generation of the exfoliation is obviated.
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