Patent ID: 9513349
Filing Date: 2016-12-06
CPC Classification: G01R,G11B

Claim Text:
1. A magnetic sensor, comprising: first and second free magnetic layers that are anti-parallel coupled with one another by a non-magnetic anti-parallel coupling layer sandwiched between the first and second free magnetic layers, the first and second free magnetic layers each having a front edge located at a media facing surface and a back edge opposite the front edge; and a magnetic bias layer located adjacent to the back edge of the first and second free magnetic layers and extending in a direction away from the media facing surface, the magnetic bias layer comprising a material having a high magnetic moment; wherein the magnetic bias layer is formed entirely of NiFe having an Fe content greater than 40 atomic percent, but not greater than 60 atomic percent; and wherein the first and second free magnetic layers and the non-magnetic anti-parallel coupling layer have first and second laterally opposed sides, the magnetic sensor further comprising first and second soft magnetic side shield structures extending from each of the first and second sides of the first and second magnetic free layers and non-magnetic anti-parallel coupling layer.