Method for producing single-sided sputtered magnetic recording disks
First Claim
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1. A method for producing an information-storage media disk having first and second interface layers, a first information storage layer on a first side of a substrate disk, and a second information storage layer on second side of the substrate disk, comprising:
- depositing the first interface layer on the first side of a substrate disk and the second interface layer on the second side of said substrate disk, respectively, wherein the first and second interface layers have differing chemical compositions, and wherein the first and second interface layers cause the substrate disk to be curved;
controlling curvature of the disk by removing unequal thicknesses from the first and second interface layers, wherein, after the removal step, the first and second interface layers remain, the thickness of the first interface layer being less than the thickness of the second interface layer and the flatness of the first and second sides is from 2 to 10 microns;
subsequently depositing the first information storage layer on the first interface layer and the second information storage layer on the second interface layer; and
controlling curvature of the information-storage media by forming the information-storage layers and the first and second interface layers to provide the information-storage media.
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Abstract
An information-storage media is provided that includes:
- (a) a substrate disk 312 having first and second opposing surfaces;
- (b) a first selected layer 304 on the first surface, the first selected layer having a first thickness;
- (c) a second selected layer 308 on the second surface, the second selected layer having a second thickness, wherein the first and second selected layers have a different chemical composition than the substrate disk; and
- (d) an information-storage layer 412 adjacent to one or both of the selected layers.
The first and second thicknesses are different to provide an unequal stress distribution across the cross-section of the media.
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Citations
13 Claims
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1. A method for producing an information-storage media disk having first and second interface layers, a first information storage layer on a first side of a substrate disk, and a second information storage layer on second side of the substrate disk, comprising:
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depositing the first interface layer on the first side of a substrate disk and the second interface layer on the second side of said substrate disk, respectively, wherein the first and second interface layers have differing chemical compositions, and wherein the first and second interface layers cause the substrate disk to be curved; controlling curvature of the disk by removing unequal thicknesses from the first and second interface layers, wherein, after the removal step, the first and second interface layers remain, the thickness of the first interface layer being less than the thickness of the second interface layer and the flatness of the first and second sides is from 2 to 10 microns; subsequently depositing the first information storage layer on the first interface layer and the second information storage layer on the second interface layer; and controlling curvature of the information-storage media by forming the information-storage layers and the first and second interface layers to provide the information-storage media. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification