Patent ID: 6185080
Filing Date: 2001-02-06
Classification: B82Y,G01R,G11B

Abstract:
A dual tunnel junction read head, which has an air bearing surface (ABS), comprising:a dual tunnel junction sensor that includes:a ferromagnetic electrically conductive first free layer;a ferromagnetic electrically conductive first pinned layer;a non-magnetic electrically insulating first barrier layer located between the first free layer and the first pinned layer;a ferromagnetic electrically conductive second pinned layer;an antiferromagnetic electrically conductive pinning layer located between the first and second pinned layers and exchange coupled to the pinned layers so as to pin the pinned layer magnetic moment in each of the pinned layers in a first direction;a ferromagnetic electrically conductive second free layer;a non-magnetic electrically insulating second barrier layer located between the second free layer and the second pinned layer; andthe first and second free layers each having a magnetic moment in a second direction.