Superior performance head design with minimized ATE and WATE
US8498079B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 2012 |
| Grant date | Jul 30, 2013 |
| Priority date | — |
| Expiry date | Sep 15, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/3163
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A PMR writer is disclosed with an all wrap around design wherein the leading shield, side shields, and composite trailing shield are comprised of an anisotropic (−Ku) magnetic layer, and where the leading shield and side shields adjoin a gap layer. The composite shield has a first layer made of an isotropic magnetic material adjoining the write gap, and the anisotropic (−Ku) layer adjoins the first trailing shield layer on a side opposite the write gap. The main pole may have a tapered leading side and a tapered trailing side with the anisotropic (−Ku) leading shield and trailing shield layers extending a greater distance from the ABS than the ends of the tapered main pole sides. Adjacent track erasure is minimized while on-track write field and field gradient are improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.