Perpendicular magnetic write head having a structure that suppresses unintended erasure of information on a write medium at a non-writing time
US7808743B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 5, 2007 |
| Grant date | Oct 5, 2010 |
| Priority date | — |
| Expiry date | Feb 28, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/3163
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A perpendicular magnetic write head includes an auxiliary magnetic pole layer disposed on a trailing or leading side of a main magnetic pole layer, the auxiliary magnetic pole layer being recessed from the main magnetic pole layer. A nonmagnetic layer is disposed in a layer same as the auxiliary magnetic pole layer and in front of the auxiliary magnetic pole layer, the nonmagnetic layer having an internal stress of a direction same as that of the main magnetic pole layer, and a write shield layer is disposed in a layer same as the auxiliary magnetic pole layer and in front of the auxiliary magnetic pole layer, the write shield layer being separated from the main magnetic pole layer with a gap layer in between. The nonmagnetic layer is arranged to fill up a space between the auxiliary magnetic pole layer and the write shield layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.