Patent ID: 7848062
Filing Date: 2010-12-07
Classification: G11B

Abstract:
1. A method to reduce sensitivity to external magnetic fields of a magnetic read-write head, comprising: providing a perpendicular magnetic writer having an ABS, a magnetic read head having an ABS that is coplanar with said writer ABS, magnetic shields on opposing sides of said read head, one of said second magnetic shields being located between said perpendicular magnetic writer and said magnetic read head, all shields having lower horizontal edges that are parallel to said ABS, and opposing vertical edges that are normal to said ABS; attaching to each shield a magnetically soft tab having a top edge that extends away from said vertical edge and, at said vertical edge, giving said tab a height that is less than that of its associated shield and a lower edge that begins as a coplanar extension of said lower horizontal edge; and sloping part of said magnetically soft tab's lower edge upwards towards its outer edge, whereby flux concentration and horizontal magnetic fields are reduced at said shield's edges.