Perpendicular magnetic recording (PMR) writer with improved trailing shield design
US10032469B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 5, 2015 |
| Grant date | Jul 24, 2018 |
| Priority date | — |
| Expiry date | Nov 5, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/3116
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A PMR (perpendicular magnetic recording) head includes a tapered write pole that is fully surrounded by wrapped-around magnetic shields, including laterally disposed side shields, a trailing shield and a leading shield. A layer of high magnetic saturation material (high Bs) is formed on the leading edge of the trailing shield and extends rearward, away from the ABS plane to define a cross-sectional write gap shape that is not conformal with the shape of the tapered write pole. The cross-sectional shape of this shield layer enables it to absorb flux from the write pole so that the flux for writing is enhanced and concentrated at the area of the recording medium being written upon and does not extend to adjacent tracks or to downtrack positions at which such flux is not desired.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.