Patent ID: 6802114
Filing Date: 2004-10-12
Classification: B82Y,G11B,Y10T

Abstract:
A method of making a magnetic head assembly having a read head and a write head comprising the steps of:a forming of the write head comprising the steps of: forming ferromagnetic first and second pole piece layers with a yoke portion between a pole tip portion and a back gap portion; forming a nonmagnetic write gap layer between the pole tip portions of the first and second pole piece layers; forming an insulation stack with at least one coil layer embedded therein in the yoke portions of the first and second pole piece layers; and connecting the first and second pole piece layers at their back gaps portions; a forming of the read head comprising the steps of: forming nonmagnetic nonconductive first and second read gap layers; forming a dual spin valve sensor between the first and second read gap layers; forming a ferromagnetic first shield layer; and forming the first and second read gap layers between the first shield layer and the first pole piece layer; a making of the dual spin valve sensor comprising the steps of: forming first and second pinned layer structures wherein each pinned layer structure has a magnetic moment; forming antiferromagnetic first and second pinning layers exchange coupled to the first and second pinned layer structures for pinning the magnetic moment of the first and second pinned layers respectively; forming an antiparallel (AP) coupled free layer structure between the first and second pinned layer structures with a magnetic moment; and forming a nonmagnetic conductive first spacer layer between the first pinned layer structure and the AP coupled free layer structure and a nonmagnetic conductive second spacer layer between the second pinned layer structure and the AP coupled free layer structure; and a making of the AP coupled free layer structure including the steps of: forming ferromagnetic first, second and third antiparallel (AP) coupled free layers; and forming a first antiparallel (AP) coupling layer between the first and second AP coupled free layers and a second antiparallel (AP) coupling layer between the second and third AP free layers.