Perpendicular magnetic recording (PMR) write shield design with minimized wide adjacent track erasure (WATE)
US9466319B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 2015 |
| Grant date | Oct 11, 2016 |
| Priority date | — |
| Expiry date | Sep 8, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/112
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A Perpendicular Magnetic Recording (PMR) writer is disclosed with an all wrap around (AWA) shield design in which one or more of the leading shield, second trailing shield, and side shields consist of a high damping (HD) magnetic material having a damping constant ≧0.04. A first trailing shield between the write gap and second trailing shield is a 19-24 kG hot seed layer. The HD magnetic layer may be FeNiRe with a Re content of 3 to 15 atomic %. Preferably, the HD magnetic layer has a coercivity <50 Oe and is a 10-19 kG material. One or both of the main pole leading and trailing sides may be tapered. Wide adjacent track erasure is minimized while area density capability is maintained. In other embodiments, the HD magnetic material may be one of FeNiM, FeNM, FeCoM, or FeCoNiM where M is a 3d, 4d, or 5d transition metal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.