Antiferromagnetically coupled thin films for magnetic recording
US6567236B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 2001 |
| Grant date | May 20, 2003 |
| Priority date | — |
| Expiry date | Nov 9, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24975
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An antiferromagnetically coupled layer structure for magnetic recording wherein the top ferromagnetic structure is a bilayer structure including a relatively thin first sublayer of ferromagnetic material in contact with the coupling/spacer layer. The first sublayer has a higher magnetic moment than the second sublayer. The layer structure of the invention results improved manufacturability and improved performance. A preferred embodiment of a layer structure according to the invention includes: a bottom ferromagnetic layer preferably of CoCr; an antiferromagnetic coupling/spacer layer preferably of Ru; and a top ferromagnetic structure including a thin first sublayer of material preferably of CoCr, CoCrB or CoPtCrB, and a thicker second sublayer of material preferably of CoPtCrB with a lower moment than the first sublayer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.