Patent ID: 8059371

Claim:
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 reader and writer 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 is an extension of said lower horizontal edge; and giving each tab a triangular shape by sloping each tab's top edge towards its lower edge so as to meet said lower edge at its point of termination, whereby flux concentration and horizontal magnetic fields are reduced at said shield's edges.