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Noise characteristics and magnetization decay of CoCr-alloy single-layered perpendicular magnetic recording media have been investigated. Noise characteristics of CoCr19Pt10 media are improved, by employing CoCr35 underlayer, by reducing cystal grain diameter, and by adding Ta to the magnetic layer. Remanent magnetization decay of CoCrPtTa media are measured. The decay rate can be reduced by employing CoCr35 underlayer. It can be further reduced by making Mr/Ms ratio higher.
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Hirayama et al. (1997) studied this question.
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