Method and system for providing a read transducer having symmetric antiferromagnetically coupled shields
US10074387B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 2014 |
| Grant date | Sep 11, 2018 |
| Priority date | — |
| Expiry date | Oct 9, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/3996
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method provides a magnetic transducer including a first antiferromagnetically coupled (AFC) shield, a second AFC shield and a read sensor between the first and second AFC shields. The first AFC shield includes first and second ferromagnetic layers and a first nonmagnetic spacer layer between the first and second ferromagnetic layers. The first and second ferromagnetic layers have first and second saturation magnetizations and first and second thicknesses, respectively. The second ferromagnetic layer is between the read sensor and the first ferromagnetic layer. The second AFC shield includes third and fourth ferromagnetic layers and a second nonmagnetic spacer layer between the third and fourth ferromagnetic layers. The third ferromagnetic layer is between the read sensor and the fourth ferromagnetic layer. The third and fourth ferromagnetic layers have third and saturation magnetizations and third and fourth thicknesses, respectively. The second AFC shield is a mirror image of the first AFC shield.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.