The magentic properties of CoCrPtBICr media were investigated to find the optimum compositions with high coercivity. It is found that the maximum coercivity of CoCrPtBICr media can be achieved by adding the same amount of Pt and B content while keeping Cr content fixed at loat.%. A very high coercivity of 3200 Oe was obtained in a Coloat.%Cr-10at.&Pt-lOat.%B/Cr film. The addition of B is also found to be effective in reducing the noise level of CoCrPt/Cr media.
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