Thin-film magnetic head, head gimbal assembly, and hard disk system
US7639451B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 2007 |
| Grant date | Dec 29, 2009 |
| Priority date | — |
| Expiry date | Jun 25, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/3116
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is a thin-film magnetic head provided, which comprises a perpendicular recording head portion including a thin-film coil adapted to generate a magnetic flux, and a main magnetic pole layer that extends rearward from a recording medium opposite plane facing a recording medium and has a main magnetic pole adapted to release a magnetic flux produced at the thin-film coil toward the recording medium. A given concave groove form that is more constricted as the lower end draws nearer is provided at or near the flare point of the front end of the main magnetic pole, so that the flow of the magnetic flux through the main magnetic pole is focused on the upper end edge (gap portion), thereby improving overwrite performance and holding back the occurrence of pole erasure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.