Patent ID: 8105703

Claim:
A CPP GMR read head, comprising: on a lower conductive lead layer, a seed layer and a pinning layer; a pinned layer on said pinning layer; a non magnetic spacer layer on said pinned layer; on said non magnetic spacer layer, a free layer that comprises a layer of Ni x Fe y , where x is between 75 and 90 and y is between 10 and 25; on said Ni x Fe y layer, a layer of Ni w Fe z , where w is between 28 and 40 and z is between 60 and 72; on said Ni w Fe z layer, a layer of Co x Fe y , where x is between 70 and 100 and y is between 0 and 30, said two NiFe layers and said CoFe layer together constituting said free layer; and on said free layer, a capping layer and an upper lead layer.