Vertical magnetic recording medium with an intermetallic compoun

Details Vertical magnetic recording medium with an intermetallic compoun Vertical magnetic recording medium with an intermetallic compoun

1985-10-28

1987-04-14

Andrews, Melvyn J.

Stock material or miscellaneous articles

All metal or with adjacent metals

Having magnetic properties, or preformed fiber orientation...

428661, 428667, 428678, 428928, G11B 566

Patent

active

046578242

ABSTRACT:
A vertical magnetic recording media has a ternary alloy magnetic layer deposited on an intermetallic compound nucleating layer. In one example the intermetallic phase of cobalt and tungsten, which occurs at a discrete stoichiometric ratio of 3 to 1, i.e. Co.sub.3 W, forms a nucleating layer deposited on the media substrate. A magntic layer of (CoCr).sub.90 W.sub.10 is formed on the nucleating layer. Both the nucleating layer and the magnetic layer have a hexagonal crystalline structure with hexagonal cell constants which are related by an integral multiple. The film structure has minimal C-axis dispersion and an excellent ratio of perpendicular to horizontal coercivities.

REFERENCES:
T. M. Coughlin, J. Vac. Sci. Technol., 20(2), Feb. 1982, "Nitrogen-Induced fcc Phase in rf Sputtered Co-Cr Films Having the hcp Phase and Perpendicular Anisotropy", pp. 171-174.
J. C. Lodder et al., Thin Solid Films, 101 (1983) 61-73, "R.F.-Sputtered CoCr Layers for Perpendicular Magnetic Recording".
"High Density Perpendicular Magnetic Recording on Rigid Disks", Fujitsu Sci. Tech. J., 19, 1, pp. 99-126, Mar. 1983.
"Recording on Perpendicular Anisotropy Media with Ring Heads", IEEE Transactions on Magnetics, vol. Mag-17, No. 6, Nov. 1981, pp. 2547-2549.
"Constitution of Binary Alloys", by Hansen, McGraw Hill, 1958, p. 519.

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