Patent ID: 7606007
Filing Date: 2009-10-20
Classification: B82Y,G01R,G11B,H01L

Abstract:
1. A magnetic head, comprising: a non-magnetic insulating portion; a magnetoresistive read sensor; and a shield disposed adjacent the magnetoresistive read sensor, wherein the shield comprises a ferromagnetic first layer, an antiferromagnetic second layer, a non-magnetic third layer, wherein the non-magnetic third layer defines an outermost conductive layer of the shield in contact with the non-magnetic insulating portion, and a ferromagnetic fourth layer, wherein the ferromagnetic first layer is less than about 500 angstroms and contacts the antiferromagnetic second layer for exchange coupling; the ferromagnetic fourth layer contacts the antiferromagnetic second layer for exchange coupling; and the ferromagnetic first and fourth layers sandwich the antiferromagnetic second layer.