Anti-ferromagnetically coupled magnetic media with combined interlayer + first magnetic layer
US6828036B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 21, 2002 |
| Grant date | Dec 7, 2004 |
| Priority date | — |
| Expiry date | Feb 21, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/265
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An anti-ferromagnetically coupled (“AFC”), high areal density magnetic recording medium of simplified thin film layer structure and having improved thermal stability and signal-to-medium noise ratio (“SMNR”) comprises a stack of thin film layers including, in overlying sequence from a surface of a non-magnetic substrate:(a) a non-magnetic seed layer (“SDL”);(b) at least one non-magnetic underlayer (“UL”);(c) a first ferromagnetic layer (“M1”);(d) a non-magnetic spacer layer (“SPL”); and(e) a second ferromagnetic layer serving as a magnetic recording layer (“M2”); wherein:the first ferromagnetic layer (c) serves as a combined interlayer (“IL”) and “bottom” magnetic layer (“BML”) and the non-magnetic spacer layer (d) provides RKKY-type coupling between the first ferromagnetic layer (c) and the second ferromagnetic layer (e) for stabilizing the medium via anti-ferromagnetic coupling (AFC) and improving the SMNR.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.