Magnetic disk with boron carbide overcoat layer

Details Magnetic disk with boron carbide overcoat layer Magnetic disk with boron carbide overcoat layer

1995-01-13

1996-09-03

Resan, Stevan A.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428213, 428216, 428336, 428694TP, 428698, 428704, 428900, G11B 572

Patent

active

055522041

ABSTRACT:
A significantly thinner boron carbide overcoat layer is provided for a magnetic disk which has the same durability as thicker prior art overcoat layers for protecting an underlying magnetic layer. By employing adhesion layers selected from the group consisting of Ge, Ru, WTiSi, WTi, Si, and Y between the magnetic layer and the overcoat layer, the durability of the overcoat layer is significantly increased over a single overcoat layer of B4C. Certain process steps in the making of the B4C overcoat layer still further enhance the durability of the B4C overcoat layer by maintaining the disk or substrate specimen at a floating potential in a plasma chamber and employing low levels of argon pressure and sputtering wattage.

REFERENCES:
patent: 4717632 (1988-01-01), Keem et al.
patent: 4840844 (1989-06-01), Futamoto et al.
patent: 5068152 (1991-11-01), Maro et al.
patent: 5236791 (1993-08-01), Yahisa
patent: 5275850 (1994-01-01), Kitoh
S. Kaplan et al., Xerox Webster Research Center, "Characterization of amorphous carbon-hydrogent films by solid-state nuclear magnetic resonance", May 7, 1985, pp. 2-5.
M. F. Doerner and R. L. White, IBM General Products Div'n, "Characterization of Amorphous Carbon Films Using Substrate Curvature", pp. 647-656 (1988).
N. Savvides, J. Appl. Phys., vol. 58, No. 1, Jul. 1985, "Four-fold to three-fold transition in diamond-like amorphous carbon films: A study of optical and electrical properties" pp. 518-521.
G. A. Samara et al., Sandia National Laboratories, "Low Temperature Dielectric Properties and ac Conductivities of the Icosahedral Boron Carbides", .COPYRGT.1991 American Institute of Physics, pp. 77-84.
J. Rey et al., "Dry Friction and Wear of Chemically Vapour Deposited Boron Carbide Coatings", Surface and Coatings Technology, 36 (1988), pp. 375-386.
Yu. G. Gogotsi et al., "Tribochemical interactions of boron carbides against steel.", Wear, 154 (1992), pp. 133-140.
Mark A. McKernan, "Magnetron sputter deposition of boron and boron carbide", Surface and Coatings Technology, 49 (1991), pp. 411-415.
M. K. Puchert et al., "Thickness-dependent stress in sputtered carbon films", J. Vac. Sci. Technol. A, vol. 12, No. 3, May/Jun. 1994, pp. 727-733.
R. Messier and R. C. Ross, "Evolution of microstructure in amorphous hydogenated silicon", J. Appl. Phys., vol. 53, No. 9, Sep. 1982, pp. 6220-6225.
S. Saito et al., "Wear-Resistant Properties of Protective Layers Applied to Thin Film Metallic Media", IEEE Transactions on Magnetics, vol.Mag-23, No. 5, Sep. 1987, pp. 2398-2400.

Affiliated with

Also associated with

Rating

Magnetic disk with boron carbide overcoat layer does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Magnetic disk with boron carbide overcoat layer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic disk with boron carbide overcoat layer will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1948634