Write head designs with sandwich trailing shield (STS) for high data rate perpendicular recording
US9990942B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 21, 2016 |
| Grant date | Jun 5, 2018 |
| Priority date | — |
| Expiry date | Nov 21, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/3912
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A PMR writer is disclosed with an all wrap around (AWA) shield design in which one or more of the leading shield, side shields, and trailing shield (TS) structure (except the hot seed layer) at the air bearing surface (ABS) are comprised of an alloy having a damping parameter α of ≥0.04 to minimize wide area track erasure (WATE). The TS structure comprises two outer magnetic layers with an 8-16 kiloGauss (kG) saturation magnetic moment on each side of a center stack with a lower write gap, a middle hot seed layer having a 19-24 kG saturation magnetic moment, and an upper magnetic layer with a 16-24 kG saturation magnetic moment, and each having a first cross-track width. The hot seed layer, upper TS magnetic layer and an overlying PP3 trailing shield promote improved area density capability (ADC).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.