Magnetic recording medium with an underlayer and a cobalt-based

Details Magnetic recording medium with an underlayer and a cobalt-based Magnetic recording medium with an underlayer and a cobalt-based

1986-04-29

1987-03-31

Sheehan, John P.

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

2041922, 360134, 360135, 360136, 427131, 427132, 428630, 428634, 428651, 428652, 428668, 428670, 428679, 428680, 428928, B32B 1500

Patent

active

046542760

ABSTRACT:
An improved cobalt-platinum (CoPt) thin film metal alloy media for horizontal magnetic recording has a coercivity substantially greater than prior CoPt thin film metal alloy media. A tungsten underlayer between the substrate and the CoPt magnetic layer improves the coercivity above that of media wiht conventional underlayers, such as chromium. The coercivity of the CoPt layer can be increased even further if the CoPt film is deposited in such a manner as to form an intermetallic compound of Co.sub.3 W in the interface region between the tungsten underlayer and the CoPt magnetic layer. The tungsten underlayer also improves the magnetic properties of the media when the magnetic layer is an alloy of cobalt-platinum-chromium (CoPtCr).

REFERENCES:
patent: 3321328 (1967-05-01), Koretzky
patent: 4438066 (1984-03-01), Aboaf et al.
Koretzky, "Electroless Deposition of Ferromagnetic Alloys" IBM Technical Disclosure Bulletin, vol. 5, No. 2, Jul. 1962, p. 59.
J. A. Aboaf, et al., "Magnetic Properties and Structure of Co-Pt Thin Films", IEEE Trans. on Magnetics, MAG-19, 1514 Jul. (1983).
M. Kitada, et al., "Magnetic Properties of Sputtered Co-Pt Thin Films", J. Appl. Phys. 54(12), Dec. 1983, pp. 7089-7094.
J. E. Opfer, et al., "Thin Film Memory Disc Development," Hewlett-Packard Journal, Nov. 1985, pp. 4-10.
R. R. Dubin, et al., "Degradation of Co-Based Thin-Film Recording Materials in Selected Corrosive Environments," J. Apply. Phys. 53(3), Mar. 1982, pp. 2579-2581.
Hansen, Constitution of Binary Alloys, McGraw Hill, 1958, p. 519.

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