Patent ID: 8670218
Filing Date: 2014-03-11
Classification: B82Y,G11B

Abstract:
1. A magnetoresistive sensor structure comprising: a substrate; a magnetoresistive sensor on the substrate and comprising a stack of layers including a ferromagnetic free layer, the free layer having a front edge and two spaced-apart side edges; an electrically insulating layer comprising a crystalline MgO layer on the side edges of the free layer and on regions of the substrate adjacent the sensor; a seed layer consisting of material selected from Ir and Ru on and in contact with the MgO layer; a layer of at least partially chemically-ordered ferromagnetic FePt alloy on and in contact with the seed layer, the FePt alloy having a face-centered-tetragonal structure with its c-axis generally in the plane of the layer; and a capping layer on and in contact with the FePt alloy layer.