Multi-layer, thin film overcoat for magnetic media disk
AssigneeHitachi Global Storage Technologies Netherlands B.V.
InventorsBruno Marchon, Daryl J. Pocker, Ricardo Ruiz, Richard L. White
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Abstract
A thin film magnetic disk overcoat for perpendicular magnetic recording media comprises three layers. The initial layer comprises a dense mixture of both SiCx and SiNy compounds. The intermediate layer is a relatively dense high energy carbon process and the outer layer is sputtered CNx. The overall thickness of the overcoat is less than about 35 Å. The overcoat has the desired lubricant interaction with the elements that comprise the magnetic layers adjacent to the overcoat. Adjusting the SiC/SiN ratio in the overcoat eliminates potential negative interaction with the magnetic layers of the disk.
Claims25
A disk for a hard disk drive, comprising:
- a disk with perpendicular magnetic recording media comprising a plurality of magnetic layers for recording data, the disk being substantially planar and having a rotational axis;
- an overcoat on the disk, the overcoat having a plurality of thin film layers, comprising:
- an initial layer comprising both SiCx and SiNy compounds;
- an intermediate layer of carbon on the initial layer;
- and
- an outer layer of CNx on the intermediate layer.
A hard disk drive, comprising:
- a disk with perpendicular magnetic recording media comprising a plurality of magnetic layers for recording data, the disk being substantially planar and having a rotational axis;
- an overcoat on the disk, the overcoat having a plurality of thin film layers, comprising:
- an initial layer comprising both SiCx and SiNy compounds;
- an intermediate layer of carbon on the initial layer;
- and
- an outer layer of CNx on the intermediate layer;
- and
- an actuator having a magnetic read head for reading data from the disk.
A method of forming an overcoat on a disk for a hard disk drive, comprising:
- (a) providing a disk with magnetic media;
- (b) depositing an initial layer on the magnetic media disk comprising both SiCx and SiNy compounds;
- (c) depositing an intermediate layer of carbon on the initial layer;
- and
- (d) depositing an outer layer of CNx on the intermediate layer to form an overcoat comprising the initial, intermediate and outer layers on the disk.
Dependencies are inferred from the claim text.