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US 5,958,545 AGranted
Controlled laser texturing glass-ceramic substrates for magnetic recording media
AssigneeSeagate Technology LLC
InventorsDavid Kuo, Don Polensky
Life of this patent
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Abstract
The height of protrusions formed during laser texturing a glass-ceramic substrate is controlled by controlling the amount of the crystalline-phase of the substrate, to less than 70% by volume. In an embodiment, the amount of crystalline-phase is controlled by heating under controlled conditions to convert a glass substrate into the glass-ceramic substrate comprising a controlled amount of crystalline phase.
Claims6
A magnetic recording medium comprising:
- a non-magnetic glass-ceramic substrate having an upper surface;
- and
- a magnetic layer on the upper surface;
- wherein:
- the upper surface contains a textured landing zone comprising a plurality of protrusions of secondary crystals grown on the upper surface by a focused, pulsed laser light beam said protrusions having a lower density than the underlying non textured glass ceramic substrate;
- and
- the glass-ceramic substrate comprises less than about 70% by volume of crystalline phase.
4 more elements
Dependencies are inferred from the claim text.