Protective overcoating for magnetic recording discs and method for forming the same
AssigneeXebec
InventorsCarl W. Nelson, Michael B. Vye
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Abstract
A protective overcoating is disclosed for a magnetic alloy thin-film recording disc that includes a magnetic alloy film formed on a disc-shaped substrate or coated substrate. The protective overcoating is formed by first sputtering onto the magnetic medium an interfacial layer of titanium, and then sputtering onto the titanium a layer of carbon. The sputtered carbon provides wear-resisting lubricity, while the titanium interface promotes the adhesion of the sputtered carbon to the magnetic medium of the recording disc.
Claims6
A protective overcoating for a magnetic alloy thin-film recording disc that includes a disc-shaped base over which is formed a magnetic alloy film to provide a magnetic recording medium, comprising:
- a. an interfacial layer of titanium bondable to both the magnetic medium of the recording disc and to carbon;
- and
- b. a layer of carbon formed by sputter deposition over said interfacial layer.
A magnetic recording disc comprising:
- a. a disc-shaped base;
- b. a film of a cobalt ferrimagnetic alloy formed on said base so as to provide a magnetic recording medium;
- c. an interfacial layer of titanium bondable to both the cobalt ferrimagnetic alloy and to carbon;
- and
- d. a layer of carbon formed by sputter deposition over said interfacial layer.
A method for forming a protective overcoating for a magnetic recording disc of the type having a disc-shaped base over which is formed a magnetic alloy film to provide a magnetic recording medium, comprising the steps of:
- a. forming onto the magnetic medium an interfacial layer of titantium bondable to the magnetic medium and to carbon;
- and
- b. thereafter, sputtering a layer of carbon onto said interfacial layer.
Dependencies are inferred from the claim text.