Multilayer-based magnetic media with hard ferromagnetic, anti-ferromagnetic, and soft ferromagnetic layers
US6753072B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 4, 2001 |
| Grant date | Jun 22, 2004 |
| Priority date | — |
| Expiry date | Sep 4, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/265
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A 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 ferromagnetic “keeper” or underlayer;(c) an anti-ferromagnetic coupling layer structure; and(d) a hard ferromagnetic perpendicular recording layer including a multilayer magnetic superlattice structure;wherein layers (b), (c), and (d) in stacked combination provide the medium with improved thermal stability and a high perpendicular coercivity which can exceed about 6,500 Oe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.