Patent ID: 7525773
Filing Date: 2009-04-28
Classification: B82Y,G11B,H01L

Abstract:
1. A thin film magnetic head comprising: a dual spin-valve magneto-resistive element, wherein said dual spin-valve magneto-resistive element comprises a dual spin-valve magneto-resistive effect multilayer film comprising a first antiferromagnetic layer, a first fixed magnetic layer, a first nonmagnetic layer, a soft magnetic layer, a second nonmagnetic layer, and a second fixed magnetic layer, wherein said first fixed magnetic layer is formed as a synthetic ferrimagnetic fixed layer comprising a first magnetic layer contacting with said first antiferromagnetic layer and having a magnetization direction fixed by an exchange coupling magnetic field of said first antiferromagnetic layer, and a second magnetic layer stacked relative to said first magnetic layer via a nonmagnetic intermediate layer, wherein said second fixed magnetic layer is formed as a synthetic ferrimagnetic fixed layer comprising a third magnetic layer located on a side of said second nonmagnetic layer, a fourth magnetic layer stacked relative to said third magnetic layer via a nonmagnetic intermediate layer, and the third and fourth magnetic layers are not in direct contact with an antiferromagnetic layer, wherein said first magnetic layer and said second magnetic layer forming said first fixed magnetic layer and said third magnetic layer and said fourth magnetic layer forming said second fixed magnetic layer are made of CoFe, wherein a static magnetic field produced from a set of end portions of said first fixed magnetic layer acts to assist and fix magnetization of said second fixed magnetic layer, a sense current applied to said dual spin-valve magneto-resistive effect multilayer film, the sense current is parallel to said second fixed magnetic layer, and said sense current generates a current magnetic field that acts to assist and fix the magnetization of said second fixed magnetic layer.