Composite writer shield for improving writer performance
US8274758B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 12, 2008 |
| Grant date | Sep 25, 2012 |
| Priority date | — |
| Expiry date | Jul 27, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/3136
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A PMR writer in a read/write head is disclosed wherein an upper shield covering the coil layer is comprised of a magnetic layer optimized for magnetic performance and a second layer used for tuning mechanical protrusion. The composite layer simultaneously provides high saturation magnetization and high permeability from the magnetic layer and low CTE from the second layer which tunes the relative spacing between the writer, reader, and the rest of the slider. In one embodiment, first and second write shields are formed on a write gap layer and have front portions at the ABS and back portions in a back gap region. The upper write shield connects on one side with the second write shield at the ABS and on a second side with the back gap region. This design can yield better reader and writer spacing for the same physical clearance which enables products with higher recording density.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.