Patent ID: 6449134
Filing Date: 2002-09-10
Classification: B82Y,G11B

Abstract:
A magnetic read head including a file resettable dual spin valve sensor comprising:the dual spin valve sensor including: first and second pinned layer structures wherein each pinned layer structure has a magnetic moment; antiferromagnetic first and second pinning layers exchange coupled to the first and second pinned layer structures respectively for pinning the magnetic moments of the first and second pinned layers respectively; an antiparallel (AP) coupled free layer structure located between the first and second pinned layer structures and having a magnetic moment; a nonmagnetic conductive first spacer layer located between the first pinned layer structure and the AP coupled free layer structure and a nonmagnetic conductive second spacer layer located between the second pinned layer structure and the AP coupled free layer structure; the AP coupled free layer structure including: an antiparallel (AP) coupling layer and ferromagnetic first and second antiparallel (AP) coupled free layers; wherein the AP coupling layer being located between the first and second AP coupled free layers, one of the first and second AP coupled free layers selected to have a thickness greater than the other of the first and second AP coupled free layer to allow file resetting, wherein one of the first and second AP coupled free layers has a higher magnetic moment than the other of the first and second AP coupled free layers and wherein the first and second anti ferromagnetic pinning layers set the magnetic moments of the first and second pinned layers when a file reset current pulse is applied, the magnetic moments of the pinned layers being set antiparallel with respect to each other so that a spin valve effect on each side of the antiparallel coupled free layer structure are additive.