Method for fabricating a pole tip in a magnetic transducer using feed-forward and feedback
US7254884B2 · kind B2 · utility
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4References
17Claims
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Key dates
| Filing date | Sep 20, 2004 |
| Grant date | Aug 14, 2007 |
| Priority date | — |
| Expiry date | Nov 24, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49052
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Methods for fabricating pole piece tips for a magnetic transducer are disclosed. The ion-milling operations for trimming P2 and notching P1 are controlled using feed-forward and feedback. The preferred method of the invention includes steps for setting four time values used in different phases of the ion-milling process based on feed-forward and feedback of measured values including the P2 width measured in the mask, multiple P2B measurements and measurement of the notch depth.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.