Perpendicular magnetic recording (PMR) write head with patterned leading shield
US10014021B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 2017 |
| Grant date | Jul 3, 2018 |
| Priority date | — |
| Expiry date | May 15, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/3163
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A perpendicular magnetic recording writer is disclosed with a leading shield (LS) having an upper layer that extends from an air bearing surface (ABS) to a backside at a first height (a). A LS lower layer has an upper surface that contacts the LS upper layer, a front side at the ABS, and a backside at a second height (b) where b>a. LS lower layer has a notch in the upper surface that is recessed from the ABS and has a first side aligned parallel to the ABS. The notch is aligned below the main pole and has a cross-track width that is from 1× to 11× the track width, and two sidewalls formed equidistant from a center plane wherein each sidewall intersects the first side at a 90 to 170 degree angle. Accordingly, overwrite, bit error rate (BER), and tracks per square inch capability are improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.