Stock material or miscellaneous articles – All metal or with adjacent metals – Foil or filament smaller than 6 mils
Patent
1986-06-02
1987-07-07
Sheehan, John P.
Stock material or miscellaneous articles
All metal or with adjacent metals
Foil or filament smaller than 6 mils
428611, 428626, 428630, 428641, 428668, 428670, 428928, B21C 3700
Patent
active
046787216
ABSTRACT:
The invention provides a magnetic recording medium comprising a substrate of a nonmagnetic material bearing a thin magnetic layer with perpendicular anistropy. The magnetic thin layer comprises alternate layers of Pd and Co. The signal-to-noise ratio upon reading the stored information is considerably improved in that the thicknesses of the individual layers of Pd are between 0.2 and 2.0 nm and that the individual layers of Co consist of at least one monolayer of Co atoms and have thicknesses which are smaller than 0.3 nm.
The thin magnet layer may be manufactured, for example, by electron beam vacuum vapor deposition of the individual layers of Pd and Co.
REFERENCES:
patent: 3479156 (1969-11-01), Ginder
patent: 4587176 (1986-05-01), Carcia
Carcia, P. F., et al., "Perpendicular Magnetic Anisotropy in Pd/Co Thin Film Layered Structures", Appl. Phys. Lett., vol. 47, No. 2, pp. 178-180 (Jul. 15, 1985).
Shinjo, T., et al., "Interface Magnetism of Fe-Sb Multilayered Films . . . ", J. Phys. Soc. Japan, vol. 52, No. 9, pp. 3154-3162 (Sep. 1983).
Den Broeder Friedrich J. A.
Draaisma Henricus J. G.
Kahle Alexander
Schechter Marc D.
Sheehan John P.
U.S. Philips Corporation
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