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Significant improvement of magnetic properties and corrosion resistance in evaporated Co-Ni recording media

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5 Author(s)
Tada, J. ; Sumitomo Metal Mining Co. Ltd., Ichikawa, Japan ; Akihiro, M. ; Takei, K. ; Satoh, T.
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An addition of a very small amount of Pr in Co-Ni films of a recording medium improves both corrosion resistance and frequency response. The columnar grains, which are induced by oblique incidence of evaporation, becomes remarkably finer by the addition of rare-earth elements. The TEM image of the cross section of the films shows a dense packed structure. High magnetization and a better corrosion resistance are considered to be due to the dense packed structure. The fine grain improves the frequency response. Among several rare-earth elements, especially Pr doping yields a best recording performance.

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Magnetics, IEEE Transactions on  (Volume:22 ,  Issue: 5 )