Merged write head with magnetically isolated poletip
US6404601B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 25, 2000 |
| Grant date | Jun 11, 2002 |
| Priority date | — |
| Expiry date | Jan 25, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/3143
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic head has an exchange isolated poletip located between a shield of an MR sensor and a write pole of an inductive sensor. The poletip is preferably made of high Bs material, allowing the flux that travels through the much larger pole layer to funnel through the poletip without saturation. The poletip is isolated from the shield layer in order to decouple the shield layer from unfavorable domain patterns that may occur in the poletip, which in turn reduces noise in the sensor, while the shield layer serves to complete the inductive circuit. Despite having a poletip isolated by nonmagnetic material, heads built according to this invention have demonstrated high overwrite as well as remarkably low noise.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.