Magnetic disk and its manufacturing method

Details Magnetic disk and its manufacturing method Magnetic disk and its manufacturing method

1996-07-01

1998-04-07

Wolff, John H.

Dynamic magnetic information storage or retrieval

Record medium

Disk

G11B 582

Patent

active

057371598

ABSTRACT:
In a thin film magnetic disk, a micro projections are formed on a substrate in a circumferential direction. A height of the micro projections is several nm to several tens of nm and a density of the micro projections is several hundred pcs/mm to several tens of thousands of pcs/mm.sup.2. With this arrangement, a magnetic disk fulfilling a head floating characteristic of a narrow space and further fulfilling a mechanical anti-sliding characteristic such as a contact start-stops characteristic and a head stickiness and the like is provided so that high reliability is attained. In the thin film magnetic disk, a bearing ratio curve of a sectional shape measured in a radial direction of the textured substrate has a bearing ratio of 0.1 to 10% at the surface layer (a cutting height of 5 to 10 nm). In this way, a pressure receiving area under a sliding of the magnetic head is increased.

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