Dual-layer carbon-based protective overcoats for recording...

Details Dual-layer carbon-based protective overcoats for recording... Dual-layer carbon-based protective overcoats for recording...

2007-02-13

2007-02-13

Bernatz, Kevin M. (Department: 1773)

Stock material or miscellaneous articles

Magnetic recording component or stock

Thin film media

C428S216000, C428S217000, C428S218000, C428S825000, C204S192200

Reexamination Certificate

active

10776191

ABSTRACT:
A recording medium, comprising:(a) a substrate having at least one surface;(b) a stacked plurality of thin film layers on the at least one surface and including at least one magnetic or magneto-optical (MO) recording layer; and(c) a protective overcoat layer on an outer surface of an outermost layer of the layer stack, comprising:(i) a first sub-layer layer (c1) of undoped tetrahedral amorphous carbon (ta-C) formed by filtered cathodic arc deposition (FCAD) on the outer surface of the outermost layer of the stacked plurality of thin film layers and having a high mass density of carbon (C) atoms greater than about 2.5 gms/cm3; and(ii) a second sub-layer (c2) of nitrogen-doped tetrahedral amorphous carbon (ta-C:N) formed by FCAD on the undoped ta-C layer and having a high mass density of carbon (C) atoms greater than about 2.0 gms/cm3.

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