Patent ID: 9472216
Filing Date: 2016-10-18
CPC Classification: G11B

Claim Text:
1. A magnetic read apparatus having an air-bearing surface (ABS) comprising: a differential read sensor including a first free layer, a second free layer and a nonmagnetic spacer layer residing between the first free layer and the second free layer in a down-track direction; at least one side bias structure adjacent to the first free layer and the second free layer in a cross-track direction perpendicular to the down-track direction, the at least one side bias structure being magnetically biasing the first free layer and for the second free layer in the cross-track direction; and at least one rear magnetic bias structure, the differential read sensor being between the ABS and at least one the rear magnetic bias structure, the at least one rear magnetic bias structure providing a first magnetic bias for the first free layer in a first direction along a stripe height direction perpendicular to the ABS and providing a second magnetic bias for the second free layer in a second direction opposite to the first direction.