磁気光学効果によるＣｏ‐Ｃｒ垂直異方性膜の特性

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Single layer Co-Cr and double layer Co-Cr/Ni-Fe film of perpendicular recording material were prepared by magnetron DC sputtering from alloy target (19∼20wt%Cr) on PET film. The coercive force perpendicular to the surface of single layer Co-Cr film was determined by means of the magneto-optical polar Kerr effect and compared with the volume coercive force measured by a vibrating sample magnetometer. The surface coercive force agreed with the volume coercive force for over all single layer films from 0.18μm to 0.48μm thickness. The comparison of perpendicular surface coercive forces between single layer Co-Cr and Co-Cr layer of double Co-Cr/Ni-Fe films was carried out. The result shows that the perpendicular surface coercive force in double layer was greater than that of single layer.From SEM studies it was found that these properties may be attributed to the development of columnar structure inside the crystal grains, caused by enhanced heating effect of substrate in virtue of presence Ni-Fe layer in double layer film. The dependence of surface coercive force upon the direction of film thickness in single and double layer film was also studied in relation to Auger analysis. Except for near the surface in double layer film, the surface coercive force was almost constant.
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