Umbrella shield writer (UmSW) design for perpendicular magnetic recording (PMR)
US8879208B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 2, 2013 |
| Grant date | Nov 4, 2014 |
| Priority date | — |
| Expiry date | Dec 2, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/3116
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An umbrella shield (UmS) is included as the uppermost magnetic layer in a trailing shield design in a read/write head to reduce stray field effects, lower bit error rate, and improve protrusion profile for better touch down detection. The UmS may be exposed or recessed from an air bearing surface (ABS), and has a cross-track width, down-track thickness, and length toward a back side that is greater than the corresponding width, thickness, and length dimensions of an underlying PP3 trailing shield. UmS may substantially conform to an arched PP3 shield shape or may be a flat layer. An insulation layer with a thickness of at least 0.3 microns is formed between the UmS and PP3 trailing shield to prevent undesirable coupling. The UmS preferably has a width greater than any other shield in the read/write head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.