Writer having a recessed trailing shield and nonmagnetic refill
US9934794B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 9, 2016 |
| Grant date | Apr 3, 2018 |
| Priority date | — |
| Expiry date | Feb 9, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/6005
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic apparatus has a media-facing surface (MFS), a pole, a write gap at the MFS, a trailing shield, coil(s) and a nonmagnetic refill material. The pole includes a pole tip proximate to the MFS. The trailing shield includes a pedestal and a recessed portion. The pedestal occupies a portion of the MFS. The recessed portion has a front surface at an acute angle from the MFS and is recessed from the MFS by a distance of not more than 0.8 micrometers. The write gap is between the pedestal and the pole tip. The coil(s) energize the pole and have at least one turn. The coil(s) are between the recessed portion of the trailing shield and the pole. The trailing shield is between the nonmagnetic refill material and the pole. A portion of the nonmagnetic refill material is between the recessed portion and the MFS.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.