Magnetic disk with boron carbide overcoat layer

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

1996-04-03

1998-05-12

Resan, Stevan A.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428694TP, 428698, 428704, 428336, 428213, 428216, G11B 0566

Patent

active

057502315

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.

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