Magnetic thin film medium comprising amorphous sealing layer for reduced lithium migration
First Claim
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1. A longitudinal or perpendicular magnetic recording medium comprising:
- a substrate comprising a glass or glass-ceramic material containing about 0.5 to about 32 wt. % lithium oxide (Li2 O);
at least one sealing layer comprising amorphous nickel-phosphorus; and
a magnetic layer, wherein the sealing substantially prevents the migration of Li from the substrate.
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Abstract
A glass or glass-ceramic substrate comprising about 0.5 to about 32 wt. % Li2 O is employed as a non-magnetic substrate of a magnetic recording medium. Migration of Li from the substrate to the medium'"'"'s surface is prevented by forming an amorphous NiP sealing layer on the substrate, with an optional adhesion enhancement layer therebetween. Embodiments include surface oxidizing the amorphous NiP sealing layer for enhanced recording performance.
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Citations
20 Claims
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1. A longitudinal or perpendicular magnetic recording medium comprising:
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a substrate comprising a glass or glass-ceramic material containing about 0.5 to about 32 wt. % lithium oxide (Li2 O); at least one sealing layer comprising amorphous nickel-phosphorus; and a magnetic layer, wherein the sealing substantially prevents the migration of Li from the substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of manufacturing a longitudinal or perpendicular magnetic recording medium, the method comprising:
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sputter depositing at least one sealing layer comprising amorphous nickel-phosphorous on a substrate comprising a glass or glass-ceramic material containing about 0.5 to about 32 wt. % lithium oxide (Li2 O); and sputter depositing a magnetic layer on the sealing layer; wherein the sealing layer substantially prevents migration of Li from the substrate. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification