PMR writer with patterned shields for adjacent track erasure improvement
US9082433B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 2014 |
| Grant date | Jul 14, 2015 |
| Priority date | — |
| Expiry date | Jun 6, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/3146
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A PMR writer is disclosed wherein one or more of the leading shield, side shields, and trailing shield are comprised of first portion that is elongated in a cross-track direction at the ABS, and a second portion consisting of a plurality of pads each having a side adjoining the first portion along a side opposite the ABS. Pads may have a polygonal shape or a shape with curvature and are separated by portions of a dielectric layer. When a length of the pads in a down-track direction is substantially greater than a width in a cross-track direction and height in a vertical direction, then shape anisotropy in the shield is biased in a down-track direction and is perpendicular to the driving flux direction from the main pole tip thereby minimizing 180 degree rotations in magnetization and associated adjacent track erasure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.