Tapered PMR write pole with straight side wall portion
US8125732B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 25, 2009 |
| Grant date | Feb 28, 2012 |
| Priority date | — |
| Expiry date | Sep 15, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/3116
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A main pole layer with a tapered trailing side is disclosed that has three sections each with a write pole portion along the ABS and a yoke portion. A lower section has a bottom surface including a leading edge at the write pole tip and sidewalls with a bevel angle between 4 and 20 degrees. The middle section has essentially vertical sidewalls with a tapered side starting at the trailing edge and extending to a back side of the write pole and into the yoke. An upper section includes a portion of the tapered side and a top surface of the main pole layer and has a sidewall with a bevel angle from 0 to 45 degrees. The thickness of the middle section is greater than the pole height variation caused by variations in back end processes including ion milling and lapping to reduce erase width (EW) variations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.