Procedure employing a diode-pumped laser for controllably texturing a disk surface
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United States of America Patent
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Jan 11, 2000
Issued Date -
N/A
app pub date -
Jan 8, 1998
filing date -
Nov 10, 1993
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Expired
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Abstract
A process for creating a 'distant bump array' surface texture in a magnetic recording disk for reducing stiction and the disk so textured. The texturing process uses a tightly focused diode-pumped Nd:YLF or Nd:YVO.sub.4 or other solid-state laser that is pulsed with a 0.3-90 nanosecond pulse train to produce a plurality of distantly-spaced bumps in the disk surface. The bump creation process is highly controllable, permitting repeated creation of a preselected bump profile such as a smooth dimple or one with a central protrusion useful for low stiction without close spacing or elevated 'roughness'. Some bump profiles permit texturing of the data-storage region of the disk surface for low stiction without materially affecting magnetic data storage density.
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