Anti-ferromagnetically coupled perpendicular magnetic recording media
US6815082B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 26, 2002 |
| Grant date | Nov 9, 2004 |
| Priority date | — |
| Expiry date | Jun 26, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/26
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A high areal recording density, anti-ferromagnetically coupled (“AFC”) perpendicular magnetic recording medium comprises:a layer stack formed over the surface of a non-magnetic substrate (2), comprising, in overlying sequence:an underlayer (3) comprised of a magnetically soft ferromagnetic material;at least one non-magnetic interlayer (4);a perpendicularly anisotropic stabilization layer (6) comprised of a hard ferromagnetic material;a non-magnetic spacer layer (7); anda perpendicularly anisotropic main recording layer (5) comprised of a hard ferromagnetic material;wherein the perpendicularly anisotropic stabilization layer (6) and the perpendicularly anisotropic main recording layer (5) are anti-ferromagnetically coupled (AFC) across the non-magnetic spacer layer (7) to orient the magnetic moments thereof anti-parallel and thereby provide the medium with increased
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.