Magnetic recording media having a CrTi underlayer deposited under a substrate bias
AssigneeHMT Technology Corporation
InventorsBrij Bihari Lal, Lan Zhang
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Abstract
A longitudinal magnetic recording medium having a CrTi underlayer deposited under a substrate bias is described. The medium has improved magnetic recording properties.
Claims15
A magnetic recording medium for longitudinal recording, comprising
- an underlayer film composed of 5-50 atomic percent titanium, balance chromium, deposited on a rigid disc substrate by sputtering in the presence of a negative voltage bias, and
- sputter deposited directly on the underlayer film, a magnetic recording film composed of an alloy including cobalt and chromium.
A method of preparing a magnetic recording medium for longitudinal recording, comprising
- depositing under a negative voltage bias an underlayer film composed of 5-50 atomic percent titanium, balance chromium, said underlayer deposited on a rigid disc substrate, and
- depositing directly on the underlayer film, a magnetic recording film composed of an alloy including cobalt and chromium.
In a method of preparing a longitudinal magnetic recording medium having an underlayer composed of an alloy of chromium and titanium and magnetic recording layer composed of a cobalt-chromium alloy, an improvement effective to increase the magnetic remanence thickness product by at least about 10%, said improvement comprising
- sputter depositing said underlayer under a negative voltage bias.
Dependencies are inferred from the claim text.