Patent ID: 7570462
Filing Date: 2009-08-04
Classification: B82Y,G11B

Abstract:
1. A bottom-type giant magnetoresistance (GMR) sensor overlaid with a uniform longitudinal bias (LB) stack, the bottom-type GMR sensor comprising: nonmagnetic and ferromagnetic seed layers; an antiferromagnetic transverse pinning layer; a ferromagnetic first pinned layer; a first nonmagnetic antiparallel-coupling spacer layer; a ferromagnetic second pinned layer, the first nonmagnetic antiparallel-coupling spacer layer being sandwiched between the first and second pinned layers; a nonmagnetic conducting spacer layer; and a ferromagnetic sense layer, the nonmagnetic conducting spacer layer being sandwiched between the ferromagnetic second pinned layer and the ferromagnetic sense layer; the uniform longitudinal bias (LB) stack consisting of: a second nonmagnetic antiparallel-coupling spacer layer; a ferromagnetic longitudinal pinned layer, the second nonmagnetic antiparallel-coupling spacer layer being sandwiched between the sense layer and the ferromagnetic longitudinal pinned layer; an antiferromagnetic longitudinal pinning layer in direct contact with and exchange-couple to the ferromagnetic longitudinal pinned layer; and a nonmagnetic cap layer.