Magnetic recording medium with B2 structured underlayer and a cobalt-based magnetic layer
AssigneeCarnegie Mellon University
InventorsLi-Lien Lee, David N. Lambeth, David E. Laughlin
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Abstract
The present invention provides a longitudinal magnetic recording media having a substrate, a Co or Co alloy based layer and an underlayer disposed between the substrate and the magnetic layer comprised of a material having a B2 ordered crystalline structure, preferably NiAl or FeAl. A thin Cr intermediate layer of about 1.0 nm to 5.0 nm thick may be positioned between the underlayer and the magnetic layer.
Claims30
A magnetic recording medium comprising:
- a substrate;
- a Co or Co alloy film forming a magnetic layer;
- and,
- an underlayer comprised of a material having a B2-ordered crystalline structure disposed between said substrate and said film.
In a magnetic recording medium having a substrate, an underlayer and a magnetic layer, the improvement comprising:
- said underlayer is comprised of a material having a B2-ordered crystalline structure disposed between said substrate and said magnetic layer.
A magnetic recording medium comprising:
- a substrate;
- a Co or Co alloy film forming a magnetic layer;
- and,
- an underlayer comprised of NiAl having a B2-ordered crystalline structure disposed between said substrate and said film.
A magnetic recording medium comprising:
- a substrate;
- a Co or Co alloy film forming a magnetic layer;
- and,
- an underlayer comprised of FeAl having a B2-ordered crystalline structure disposed between said substrate and said film.
A magnetic recording medium comprising:
- a substrate;
- a Co or Co alloy film forming a magnetic layer;
- and
- an underlayer between about 10 to 200 nm thick comprised of a material having a B2-ordered crystalline structure disposed between said substrate and said film.
In a magnetic recording medium having a substrate, an underlayer and a magnetic layer, the improvement comprising;
- said underlayer is comprised of a material having a B2-ordered crystalline structure between about 10 to 200 nm thick disposed between said substrate and said magnetic layer.
An apparatus for data storage comprising:
- a hard disk comprising,
- a substrate forming the disk,
- a Co or Co alloy film forming a magnetic layer, and,
- an underlayer comprised of material having a B2-ordered crystalline structure disposed between said substrate and said film;
- and,
- a magnetic transducer positioned in close proximity to said disk to record and read data to and from said disk.
A method of producing an epitaxial crystalline Co or Co alloy magnetic layer on a recording substrate, said method comprising:
- depositing material having a B2 structure on the substrate;
- and,
- growing the Co or Co alloy magnetic layer on the B2 structure.
Dependencies are inferred from the claim text.