PMR write head with assisted magnetic layer
US8284516B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 8, 2011 |
| Grant date | Oct 9, 2012 |
| Priority date | — |
| Expiry date | Apr 8, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49032
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A PMR writer is disclosed wherein a magnetic assist layer (MAL) made of an anisotropic (−Ku) or (+Ku) magnetic material is formed along a main pole trailing side to optimize the vertical magnetic field and field gradient at the air bearing surface. A Ru seed layer is formed between the main pole and (−Ku) MAL to induce a hard axis direction toward the main pole. A (−Ku) MAL is preferably comprised of hcp-CoIr while CoPt and FePt are examples of a (+Ku) MAL. The MAL has a down-track thickness from 5 to 20 nm, a width equal to the track width in a cross-track direction, and extends 100 to 500 nm in a direction toward a back end of the main pole. As a result, flux leakage from the main pole to trailing shield is reduced and aerial density is increased. A method for fabricating the PMR writer is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.