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US 6,068,891 AGranted
Method for laser texturing a glass ceramic substrate and the resulting substrate
AssigneeKomag, Inc.
InventorsThomas A. O'Dell, David Treves, Tu Chen
Life of this patent
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Abstract
A method for texturing a glass ceramic substrate comprising the steps of applying a laser pulse to the substrate such that a portion of said substrate is heated to a temperature higher than the glass transition temperature of the glass phase of said substrate but lower than the melting point of the crystal phase of said substrate.
Claims13
A method for manufacturing a magnetic disk comprising the steps of:
- texturing a glass ceramic substrate by applying a laser pulse to said substrate such that a portion of said substrate is heated to a temperature higher than the glass transition temperature of the glass phase of said substrate but lower than the melting point of the crystal phase of said substrate, said step of applying a laser pulse resulting in a protrusion extending outwardly from said substrate, small texture features being on and extending from said protrusion, wherein said protrusion has a width between 1 and 30 microns and a height between 1 and 50 nm, said small texture features having widths between 0.05 and 3 microns and peak to valley distances between 1 and 40 nm;
- and
- depositing a magnetic layer over said substrate after said step of texturing.
A method for manufacturing a magnetic disk comprising the steps of:
- texturing a glass ceramic substrate by applying a series of laser pulses to said substrate, wherein said series of laser pulses results in a series of areas being transformed into a series of positive protrusions, wherein the majority of protrusions have a width between 1 and 30 microns and a height between 1 and 50 nm, and wherein the majority of protrusions include small texture features on the top surface thereof, said small texture features having widths less than the width of said protrusion, said texture features having widths between 0.05 and 3 microns and peak to valley distances between 1 and 40 nm;
- and
- depositing a magnetic layer over said substrate after said step of texturing.
Dependencies are inferred from the claim text.