Patent ID: 8139321

Claim:
A perpendicular magnetic recording write head for magnetizing regions of a magnetic recording layer comprising: a substrate; and a laminated main pole on the substrate and having an end for facing the recording layer, the main pole comprising: a first ferromagnetic multilayer comprising a first FeCo/NiFe/FeCo trilayer on the substrate; a second ferromagnetic multilayer comprising a second FeCo/NiFe/FeCo trilayer, the first multilayer being located between the substrate and the second multilayer; an antiferromagnetically coupling (AFC) film between the first and second multilayers, the AFC film consisting essentially of Ru and being located on and in contact with a FeCo layer of the first multilayer; and an AFC-adjacent layer of a NiFe alloy on the surface of the AFC film farther from the substrate and in contact with the AFC film, a FeCo layer of the second multilayer being located on and in contact with the AFC-adjacent NiFe layer, the AFC-adjacent NiFe layer having Ni present in an amount between 25 and 95 atomic percent and a thickness between 10 and 50 Angstroms.