Method of manufacturing a magnetic write head mold for neck height equalization
US7975366B2 · kind B2 · utility
1Cited by
7References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 14, 2007 |
| Grant date | Jul 12, 2011 |
| Priority date | — |
| Expiry date | Apr 6, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49147
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A process to reduce the bevel angle in a mold used to form a write head is disclosed. First, tantalum is used instead of alumina for the yoke area. Then both the tantalum and the alumina areas are simultaneously subjected to reactive ion etching, leading to sloping sidewalls in the alumina area (write pole) while providing near vertical sidewalls in the tantalum (yoke) area. Consequently, the neck height is the same at the cavity floor as it is at the cavity top.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.