Thin film magnetic head having a pair of magnetic layers whose magnetization is controlled by shield layers
US8189303B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 12, 2008 |
| Grant date | May 29, 2012 |
| Priority date | — |
| Expiry date | Mar 19, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/3912
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A thin film magnetic head includes a magneto-resistance (MR) laminated body, a lower shield layer and an upper shield layer that face the first MR magnetic layer. The lower and upper shield layers respectively have first and second anti-parallel layers and first and second antiferromagnetic layers. An exchange coupling intensity relating to an antiferromagnetic coupling between the second anti-parallel layer and the second antiferromagnetic layer is greater in the peripheral area of a projection area than that of the projection area of the upper shield layer side end surface of the MR laminated body to the film surface's orthogonal direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.