Patent ID: 7075756
Filing Date: 2006-07-11
Classification: G11B

Abstract:
1. A read/write head for a disk drive, the head being suitable for perpendicularly recording data in adjacent magnetic recording media, the media including a first layer for recording data and a second layer that is a soft underlayer (SUL) to return magnetic flux to the read/write head, the first layer being characterized in part by a media anisotropy field and a media self-demagnetization field, the head comprising: a first and second shield; a magnetoresistive sensor located between the first and second shield; a write pole located proximate the second shield; one or more electrically conductive coils associated with the write pole; and a write shield located proximate an opposite side of the write pole from the second shield; wherein a write field is induced between the write pole and the SUL and a return field is induced between the write shield and the SUL, and further wherein the read/write head is configured so that the return field in the write shield is of opposite polarity than the write field and is of a magnitude that is less than thirty percent of the difference between the media anisotropy field and the media self-demagnetization field.