Perpendicular recording media with soft magnetic superlattice underlayer
US6641935B1 · kind B1 · utility
47Cited by
4References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 20, 2001 |
| Grant date | Nov 4, 2003 |
| Priority date | — |
| Expiry date | Sep 20, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/265
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A low noise, high areal recording density, perpendicular magnetic recording medium, comprises:(a) a non-magnetic substrate having a surface with a layer stack formed thereon, the layer stack comprising, in overlying sequence from the substrate surface:(b) a soft magnetic underlayer comprised of a soft magnetic multilayer superlattice structure; and(c) a perpendicularly anisotropic, hard magnetic recording layer.Embodiments of the invention include providing the soft magnetic multilayer superlattice structure in the form of n stacked soft magnetic/non-magnetic layer pairs, where n is an integer between about 2 and about 9.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.