Structure for and method of making magnetic recording media
AssigneeCarnegie Mellon University
InventorsLi-Lien Lee, David N. Lambeth, David E. Laughlin, Byung-Ki Cheong
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Abstract
The present invention provides a longitudinal magnetic recording media having a substrate, optionally, a sputter deposited MgO seed layer, a Co or Co alloy based magnetic layer and an underlayer disposed between the substrate and the magnetic layer comprised of a material having a body centered cubic derivative ordered crystalline structure, preferably a B2, DO3 or L21 structure. The material may be for example, NiAl, FeAl or Mn3Si. A thin Cr or Cr alloy intermediate layer of about 1.0 nm to 5.0 nm thick may be positioned between the underlayer and the magnetic layer.
Claims18
A magnetic recording medium comprising:
- a substrate;
- a cobalt or cobalt alloy film forming a crystalline magnetic layer;
- and,
- an underlayer comprised of a material having a body centered cubic derivative structure disposed between said substrate and said film, wherein said material has a body centered cubic structure selected from DO3 and L21.
A method of producing an epitaxial crystalline Co or Co alloy magnetic layer on a recording substrate, said method comprising:
- depositing material having a body centered cubic derivative structure to form an underlayer between the substrate and the magnetic layer, wherein said material has a body centered cubic structure selected from DO3 and L21;
- and, growing the Co or Co alloy crystalline magnetic layer on the body centered cubic derivative structure.
An apparatus for data storage comprising:
- a hard disk comprising,
- a substrate forming the disk,
- a Co or Co alloy film forming a crystalline magnetic layer, and,
- an underlayer comprised of a material having a body centered cubic derivative crystalline structure disposed between said substrate and said film, wherein said material has a body centered cubic structure selected from DO3 and L21;
- and,
- a magnetic transducer positioned proximate to said disk to record and read data to and from said disk.
Dependencies are inferred from the claim text.