Method for fabricating a pole tip in a magnetic transducer using feed-forward and feedback

摘要

Methods for fabricating pole piece tips for a magnetic transducer are disclosed. The ion-milling operations for trimming P 2 and notching P 1 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 P 2 width measured in the mask, multiple P 2 B measurements and measurement of the notch depth.