Thin film magnetic head with magnetic films with increasing widths from a surface facing a recording medium
US6381093B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1998 |
| Grant date | Apr 30, 2002 |
| Priority date | — |
| Expiry date | Sep 29, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/3146
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a thin film magnetic head which eliminates the problems of degradation in the recording magnetic field pitch and recording bleed occurring due to leaked magnetic field by preventing magnetic saturation from occurring at pole tips. A write element is provided with a first pole portion, a second pole portion and a gap film. The gap film is provided between the first pole portion and the second pole portion. The second pole portion includes a third magnetic film and a fourth magnetic film. The third magnetic film is adjacent to the gap film and the fourth magnetic film is adjacent to the third magnetic film. The third magnetic film has a width W20 at a position receding from its surface facing opposite the medium by a receding quantity &Dgr;L, which is larger than the width W21 at the surface facing opposite the medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.