Eliminating gel particle-related defects for obtaining sub-micron flyability over sol-gel—coated disk substrates
US6572922B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 24, 2001 |
| Grant date | Jun 3, 2003 |
| Priority date | — |
| Expiry date | Jul 24, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/8404
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of manufacturing a magnetic recording medium comprises steps of:(a) preparing a sol solution containing gel particles;(b) treating the sol solution to remove gel particles having a size greater than a predetermined maximum size;(c) providing a non-magnetic substrate for a magnetic recording medium, the substrate including a surface; and(d) applying a layer of the treated sol solution to the surface of the substrate;(e) converting the layer of treated sol solution to a layer of sol-gel having a hardness less than that of the surface of the substrate, an exposed surface of the layer of sol-gel having very low surface micro-waviness and substantially no defects in the form of protrusions or bumps;(f) forming a pattern in the exposed surface of the layer of sol-gel;(g) converting the layer of sol-gel to a glass or glass-like layer having a density and hardness substantially comparable to that of the surface of the substrate, while preserving the pattern formed in an exposed surface of the glass or glass-like layer and(h) forming a stack of thin film layers over an exposed surface of the glass or glass-like layer formed in step (g), the stack of layers including at least one fe…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.