Magnetic recording disk and disk drive with improved head-disk i

Details Magnetic recording disk and disk drive with improved head-disk i Magnetic recording disk and disk drive with improved head-disk i

1993-10-06

1996-10-29

Kiliman, Leszek

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 654, 428 655, 428141, 428336, 428408, 428694T, 428694TP, 428694TC, 428695, 428900, 360133, 360135, 360900, B32B 302, G11B 566, B32P 900

Patent

active

055695060

ABSTRACT:
A thin film metal alloy magnetic recording disk has an improved protective overcoat that creates a low level of static friction in a contact start/stop disk drive. The disk has an amorphous carbon overcoat containing a transition liquid metal interlayer (TLMI). The carbon overcoat is formed by depositing an initial amorphous carbon layer to a first thickness, then depositing an interlayer material of a low-melting point metal or metal alloy (such as In or In--Nb) while maintaining the temperature of the disk substrate above the melting point of the interlayer material, and then depositing a top additional layer of amorphous carbon. Because the initial carbon layer presents a nonwetting surface, the interlayer material "balls up" on the carbon and forms discontinuous spheres of the interlayer material. The additional top layer of carbon bonds to the initial carbon layer and to the metal or metal alloy spheres. The completed disk protective overcoat presents a continuous but textured surface of amorphous carbon for the head-disk interface in the disk drive.

REFERENCES:
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patent: 5159508 (1992-10-01), Grill et al.
patent: 5266409 (1993-11-01), Schmidt
patent: 5275850 (1994-01-01), Kitoh
Cheng et al., "Disk with Patterned Overcoat and Flat Magnetic Underlayer", IBM Technical Disclosure Bulletin, vol. 32, No. 5B, Oct. 1989, p. 264.
Kaufman et al., "Symmetry Breaking in Nitrogen-doped Amorphous Carbon: Infrared Observation of the Raman-active G and D Bands", Physical Review B: Condensed Matter, 3rd Series, vol. 39, No. 18, Jun. 15, 1989, pp. 13053-13060.
Tsai et al., "Structure and Properties of Sputtered Carbon Overcoats on Rigid Magnetic Media Disks", Journal of Vacuum Science technology, vol. A6, No. 4, Jul./Aug. 1988, pp. 2307-2315.

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