Method of coating smooth electroless nickel on magnetic memory disks and related memory devices
OwnerLeonard Nanisinventor
Life of this patent
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Abstract
A method of manufacture of thin film magnetic disks and other useful articles of similar planar geometry in which a non-magnetic layer is first deposited on one or both sides of the disk or article substrate to mask chemical and mechanically induced heterogeneities introduced by pre-polishing to achieve a smooth finish, typically resulting in cold-working of the surface, and to also bind to the substrate and is then coated with a thin layer of metal selected to either reactively or catalytically initiate smooth, electroless deposition of a non-magnetic nickel alloy which is subsequently polished and coated with additional thin layers to provide magnetic read-write capability. A disk drive using one or more of such disks is provided.
Claims17
A magnetic memory device, comprising:
- a drive motor and head assembly;
- and one or more magnetic disks comprising:
- a substrate having a super smooth surface;
- a thin metallic layer on the super smooth surface of the substrate and having a surface opposite the super smooth surface of the substrate, the thin metallic layer comprising a material selected to bind to the substrate and to mask chemical and mechanical variations of the substrate, and to reactively or catalytically nucleate the electroless plating of nickel alloy;
- a nickel alloy layer on the surface of the thin metallic layer, the nickel alloy layer having a super smooth surface;
- and
- a magnetic layer on the super smooth surface of the nickel alloy layer.
Dependencies are inferred from the claim text.