Perpendicular recording medium with antiferromagnetic exchange coupling in soft magnetic underlayers
US6818330B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 2001 |
| Grant date | Nov 16, 2004 |
| Priority date | — |
| Expiry date | Jan 8, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/265
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A perpendicular magnetic recording medium with antiferromagnetic coupling in a soft magnetic underlayer. The soft magnetic underlayer includes a first magnetic soft layer, a first interface layer on the first magnetic soft layer, a second magnetic soft layer, a second interface layer on the second magnetic soft layer, and a non-magnetic coupling layer between the first interface layer and the second interface layer. The first and second magnetic soft layers are antiferromagnetically exchange coupled to one another through the non-magnetic coupling layer, wherein the first and second interface layers increase the exchange coupling between the first and second magnetic soft layers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.