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AssigneeHitachi, Ltd.
InventorsHiroaki Okudaira, Hitoshi Oka, Masako Fujisawa, Yoshio Gobara, Nobuo Nakagawa
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Disclosed is a magnetic recording medium in which an underlayer formed below a magnetic medium, in which a signal is written, is composed of a nickel alloy comprising 0.05 to 10 atom % of tungsten and 14 to 30 atom % of phosphorus. In this magnetic recording medium, the temperature for formation of magnetic medium and the temperature for formation of a protective film can be elevated over the levels adopted in the conventional techniques. Therefore, the magnetic characteristics and abrasion resistance can be improved. Furthermore, the magnetic recording medium is excellent in the mechanical strength and corrosion resistance. Accordingly, the reliability of the magnetic medium can be highly improved.
A magnetic recording medium comprising a magnetic medium and an underlayer formed below the magnetic medium, wherein the underlayer is composed of an amorphous and non-magnetic alloy comprising 0.05 to 10 atom % of tungsten and 14 to 30 atom % of phosphorus, with the balance being nickel.
A magnetic recording medium comprising a nonmagnetic substrate, an underlayer formed on the substrate, a magnetic medium layer formed on the underlayer and a protective film formed on the magnetic medium layer, wherein the underlayer is composed of an amorphous and non-magnetic alloy comprising 0.05 to 10 atom % of tungsten and 14 to 30 atom % of phosphorus, with the balance being nickel.
A magnetic recording medium comprising a nonmagnetic substrate, an underlayer formed on the substrate, a magnetic medium layer formed on the underlayer and a protective film formed on the magnetic medium layer, wherein the underlayer is composed of an amorphous and non-magnetic alloy comprising 0.05 to 10 atom % of tungsten, 14 to 30 atom % of phosphorus, 0.001 to 25 atom % of at least one element selected from the group consisting of copper, zinc, silver, gold, palladium, rhodium manganese, molybdenum, rhenium, chromium, vanadium, titanium and boron, with the balance consisting essentially of nickel.
Dependencies are inferred from the claim text.