Patent ID: 7390530

Claim:
A process to manufacture a CPP GMR read head, having a free layer, comprising: depositing, in unbroken succession on a lower lead layer, a seed layer and a pinning layer; on said pinning layer, depositing a pinned layer; depositing a non magnetic spacer layer on said pinned layer; on said non magnetic spacer layer, depositing 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, depositing 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, depositing 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 the free layer; and on said free layer, depositing a capping layer and then an upper lead layer, thereby forming said CPP GMR read head.