The magnetic properties, structure and recording characteristics of CoCrTa and CoCrPt single-layered perpendicular magnetic recording media have been investigated. Multilayered magnetic film media with Ti interlayer have smaller crystal grains and lower medium noise than single-layered magnetic film media. Non-magnetic CoCr-alloy underlayers also have an effect on decreasing the medium noise.
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Hirayama et al. (1995) studied this question.
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