Patent ID: 8749926
Filing Date: 2014-06-10
Classification: B82Y,G11B

Abstract:
1. A magnetic read sensor, comprising: a sensor stack that includes first and second magnetic free layers that are anti-parallel coupled across a non-magnetic layer sandwiched there-between; a magnetic side shield structure formed at a side of the sensor stack; and a non-magnetic, electrically insulating layer separating the magnetic side shield structure from the sensor stack; wherein: the magnetic side shield structure further comprises a first and second magnetic layers and an exchange coupling layer sandwiched between the first and second magnetic layers; the magnetic layers are anti-parallel coupled with one another across the exchange coupling layer; the first magnetic layer is laterally aligned with the first magnetic free layer of the sensor stack and provides a magnetic bias field in a first direction parallel with an air bearing surface; and the second magnetic layer is laterally aligned with the second magnetic free layer of the sensor stack and provides a magnetic bias field in a second direction that is opposite to the first direction.