Patent ID: 9401163
Filing Date: 2016-07-26
CPC Classification: G11B,H01L

Claim Text:
1. A reader comprising: top and bottom reader stacks disposed between a top and bottom shield, the top and bottom reader stacks offset relative to each other in a downtrack direction; top side shields surrounding the top reader stack in a crosstrack direction; bottom side shields surrounding the bottom reader stack in the crosstrack direction; a split middle shield between the top and bottom reader stacks and the top and bottom side shields, the split middle shield comprising top and bottom portions separated by an isolation layer, the top and bottom portions respectively coupled to the top and bottom reader stacks, the bottom portion of the split middle shield comprising a synthetic antiferromagnetic multi-layer structure, and the top portion of the split middle shield comprising a soft magnetic layer; and antiferromagnetic tabs surrounding the bottom side shields in the crosstrack direction.