Method for manufacturing glass substrate for information recording medium
A technology for glass substrates and information recording, which is used in the manufacture of record carriers, magnetic recording, and information storage, etc. It can solve the problems of reduced SN ratio of reproduced signals, damage to thermal stability of magnetic particles, etc., and achieve high recording capacity and repair flatness. good effect
Inactive Publication Date: 2015-11-25
AGC INC
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Problems solved by technology
However, as the recording density increases, the miniaturization of magnetic particles impairs thermal stability, crosstalk, and the SN ratio of reproduced signals decrease.
Method used
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Embodiment
[0104] Hereinafter, examples of the present invention will be specifically described, but the present invention is not limited thereto.
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Abstract
A process for producing a glass substrate for information recording media, comprising lapping a glass disk made of low alkali aluminosilicate glass that contains no alkali metal oxide or contains alkali metal oxides in a total amount of less than 4 mol %, and subsequently polishing the glass disk by using a slurry that contains cerium oxide abrasives, characterized by cleaning the glass disk by using a cleaning liquid that contains sulfuric acid at a concentration of from 20 mass % to 80 mass % and hydrogen peroxide at a concentration of from 0.5 mass % to 10 mass % at a liquid temperature of from 50° C. to 100° C., and thereafter polishing the main surface of the glass disk, by using a slurry that contains colloidal silica abrasives.
Description
technical field [0001] This invention relates to the glass substrate for information recording media, its manufacturing method, and a magnetic recording medium, More specifically, it is related with the improvement of the cleaning process after glass substrate grinding|polishing. Background technique [0002] In recent years, there have been two major technical problems with regard to glass substrates for high-capacity hard disks. That is, the heat resistance of the substrate and the removal of foreign matter remaining on the substrate. [0003] With the increase in the recording capacity of hard disk drives, high recording density is rapidly advancing. However, as the recording density becomes higher, the miniaturization of magnetic grains impairs thermal stability, crosstalk, and the SN ratio of reproduced signals decrease. Therefore, heat-assisted magnetic recording technology has attracted attention as a fusion technology of light and magnetism. This is because this t...
Claims
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IPC IPC(8): G11B5/84C03C3/087C03C3/091C03C19/00
CPCG11B5/7315C03C3/091C03C19/00C03C23/0075G11B5/8404G11B5/73921
Inventor 中岛哲也宫谷克明
Owner AGC INC