Patent ID: 9384763
Filing Date: 2016-07-05
CPC Classification: G11B

Claim Text:
1. A magnetic read apparatus having an air-bearing surface (ABS) comprising: a read sensor including a first free layer having a first upper surface and a first lower surface, a spacer layer, and a second free layer having a second lower surface and a second upper surface, the spacer layer being nonmagnetic and residing between the upper surface of the first free layer and the lower surface of second free layer, the read sensor having a rear surface opposite to the ABS; a side bias structure adjacent to at least one side surface of the read sensor, the side bias structure being configured to magnetically bias the first free layer and the second free layer to be antiferromagnetically aligned; and a rear magnetic bias structure configured to bias the first free layer and the second free layer in a scissor mode, the read sensor being between the ABS and the rear magnetic bias structure, the rear magnetic bias structure including a rear soft magnetic bias structure having a saturation magnetization-thickness product of at least one milli-emu/cm