Experimental study of the external fringing field on integrated head

Abstract

We have presented calculations of write field from an integrated head. These approach was based on a micromagnetism analysis. We have shown that it was possible to modify the magnetic potential on finite pole tips surface, in order to minimize the extra-pulse effect caused by negative trailins pde fields, by changing the multilayered structure of pole tips. The purpose of this paper is to show the practical recording efficiency of such structure. We have chosen tape recording, because the phenomenon is more significant on thick recording medium. Like conventional heads, it is the last gap corner field in regard to the tape motion which gives the magnetization distribution in the medium. On a integrated head it's the last pole piece field which drive the tape magnetization. When the write head is symmetric in regard to its gap axis (y), it appears as read-back distortion due to the magnetization distribution in the medium. If we change the multilayered structure only on the writing (last) pole tip, the magnetization distribution in the medium is modified, and the distortion can be made to disappear. It's of course a write phenomenon because the read head is symmetric and the same in the both cases. A discussion explains why the distortion with symmetric write heads is more significant when there are transitions interacting.