Patent ID: 8810962
Filing Date: 2014-08-19
Classification: G11B,Y10T

Abstract:
1. A magnetic head comprised of a read head structure formed on a substrate and an overlying write head including a heating element formed on an opposite side of the read head structure with respect to the substrate, said read head structure comprises: (a) an insulation layer having a top surface and formed on the substrate, and with a side adjoining an air bearing surface (ABS); (b) a non-magnetic insertion layer formed in the insulation layer, said non-magnetic insertion layer is a metal or alloy and is recessed a certain distance from the ABS and has a top surface that is coplanar with the top surface of the insulation layer and contacts an overlying bottom (S1) shield, the non-magnetic insertion layer and other layers in the read head structure and write head expand toward a magnetic medium proximate to the ABS when heat is applied from the heating element wherein the ratio of write head expansion/read head expansion is controlled by a volume of the non-magnetic insertion layer; and (c) the bottom (S1) shield formed on the non-magnetic insertion layer and on a portion of the insulation layer.