Magnetic recording medium with substantially uniform sub-micron-

Details Magnetic recording medium with substantially uniform sub-micron- Magnetic recording medium with substantially uniform sub-micron-

1996-10-02

2000-02-08

Kiliman, Leszek

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428336, 428611, 428660, 428666, 428667, 428680, 428694TS, 428694TP, 428694ST, 428694TM, 428694TR, 428900, 427128, 427131, 2041922, G11B 566

Patent

active

060226099

ABSTRACT:
The signal-to-noise ratio of a magnetic recording medium having a thin magnetic layer is improved by adjusting the deposition conditions of the underlayer so that the magnetic layer is pseudo-epitaxially grown with a substantially uniform sub-micron-scale morphology. Uniform sub-micron-scale morphology can be attained by strategic selection of the underlayer and magnetic layer materials, and by controlling the underlayer deposition conditions so that the magnetic layer is epitaxially grown by a growth mechanism which is predominantly layer by layer. In an embodiment of the present invention, an underlayer comprising an alloy of chromium with vanadium, titanium or manganese, or an underlayer comprising a nickel-aluminum alloy, is sputter deposited at a pressure less than about 10 mTorr, substrate temperature greater than about 300.degree. C. and substrate bias greater than about 300 V, and a cobalt magnetic layer is epitaxially grown thereon, predominantly layer by layer.

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Bauer et al., Materials Reports, "Fundamental issues in heteroepitaxy--A Department of Energy, Council on Materials Science Panel Report," J. Mater. Res., vol. 5, No. 4, Apr. 1990, pp. 852-856.
J.A. Venables et al., "Nucleation and growth of thin films," Rep. Prog. Phys., vol. 47, 1984, pp. 399-405.

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