Magnetic recording medium having a nitrogen-containing barrier layer
AssigneeHMT Technology Corporation
InventorsSudhir S. Malhotra, Brij Bihari Lal, James L. Chao, Michael A. Russak
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Abstract
A magnetic recording medium having a barrier layer deposited directly on the magnetic recording layer is described. The barrier layer is deposited by sputter deposition under a nitrogen-containing sputtering atmosphere to form a nitrogen-containing chromium or chromium alloy barrier layer. The barrier layer is effective to inhibit migration of cobalt from the underlying magnetic recording layer, reducing corrosion of the medium and improving magnetic recording performance.
Claims18
A magnetic recording medium, comprising
- a nonmagnetic, disc substrate,
- an underlayer formed on the substrate,
- a magnetic recording layer formed on the underlayer, and
- a barrier layer deposited on said magnetic recording layer by sputter deposition in a nitrogen-containing atmosphere, said barrier layer being composed of chromium or a chromium-based alloy and having a thickness of between 10-50 .ANG..
An improvement in a magnetic recording medium formed on a disc substrate and having an underlayer, a magnetic recording layer and a chromium barrier layer deposited directly on the magnetic recording layer, the improvement comprising,
- a chromium or chromium-based alloy barrier layer containing nitrogen and having a thickness of between 10-50 .ANG..
A method of preparing a magnetic recording medium formed on a substrate and having an underlayer and a magnetic recording layer, comprising,
- depositing by sputter deposition in a nitrogen-containing sputtering atmosphere, a barrier layer directly on the magnetic recording layer, said layer being composed of chromium or a chromium-based alloy and having a thickness of between 10-50 .ANG..
Dependencies are inferred from the claim text.