Magnetic recording medium with a chromium alloy underlayer and a

Details Magnetic recording medium with a chromium alloy underlayer and a Magnetic recording medium with a chromium alloy underlayer and a

1986-04-29

1987-03-24

Sheehan, John P.

Stock material or miscellaneous articles

All metal or with adjacent metals

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

428630, 428634, 428651, 428667, 428668, 428928, 428652, 428679, 428680, 360134, 360135, 360136, B32B 1500

Patent

active

046524991

ABSTRACT:
An improved cobalt-platinum (CoPt) thin film metal alloy media for horizontal magnetic recording has a squareness greater than prior CoPt thin film metal alloy media. An underlayer of a body-centered-cubic (BCC) chromium-based alloy with a lattice cell constant greater than chromium (Cr), such as chromium-vanadium (CrV), is formed between the substate and the CoPt magnetic layer. The 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
Koretzky, "Electroless Deposition 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-14 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.

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