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US 7,255,942 B2Granted
Using plated surface for recording media without polishing
AssigneeSeagate Technology LLC
InventorsConnie C. Liu, Linda L. Zhong, Ian J. Beresford, Lin Huang, Joseph Leigh, David E. Brown
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Abstract
Ultra smooth as-deposited composite nickel coatings for use in an information storage system are provided. The composite nickel coatings include an electrolessly deposited nickel layer formed on a sputter deposited nickel layer. The composite nickel coatings have an as-deposited surface roughness of less than about 10 Å. Embodiments include formation of the composite nickel coating on a disk, followed by deposition of an underlayer and magnetic layer thereon to form a magnetic recording medium.
Claims7
A magnetic recording medium comprising, in this order:
- (a) a non-magnetic substrate,
- (b) a composite nickel-containing coating comprising a sputter deposited nickel-containing layer comprising NiP and an electrolessly deposited nickel-containing layer thereon, the composite nickel-containing coating having a bottom surface contacting the non-magnetic substrate and a top surface, and
- (c) a magnetic recording layer on the top surface of the composite nickel-containing coating,
- wherein the top surface of the composite nickel-containing coating is a non-polished surface and has a surface roughness (Ra) of less than about 10 Å, wherein the surface roughness (Ra) is averaged over the entire surface of the top surface of the composite nickel-containing coating.
1 more element
Dependencies are inferred from the claim text.