Dual perpendicular magnetic recording (PMR) writer base structures and mirror imaged asymmetrical magnetic core shapes for reduced writer-writer spacing (WWS)
US10418054B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 6, 2018 |
| Grant date | Sep 17, 2019 |
| Priority date | — |
| Expiry date | Mar 6, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/3173
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A dual PMR writer is disclosed wherein a first main pole (MP1) in writer 1 is a mirror image of a second main pole (MP2) in writer 2 with respect to a center plane aligned orthogonal to the air bearing surface (ABS). MP1 and MP2 may have an asymmetrical top-down shape to reduce writer-writer spacing (WWS) and read write offset (RWO) when a single or double reader is positioned down-track at the center plane. Accordingly, there is less track misregistration and better area density capability. Each of MP1 and MP2 as well as a top yoke (TY), and a tapered bottom yoke (tBY) have a rectangular back portion of width “w” from 4 to 10 microns. Spacing between MP1 and MP2 back portions may be ≥4 microns to prevent cross-talk. RWO is reduced from ≥4 microns for symmetrical TY/MP/tBY shapes to 3 microns or less for asymmetrical shapes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.