Patent ID: 7061730
Filing Date: 2006-06-13
Classification: B82Y,G11B,H01F

Abstract:
1. A spin valve type magnetoresistive read element for reading high recorded density, high RPM magnetic disks, having a conducting lead layer of high sheet conductivity, high hardness, high melting point, high corrosion resistance and lacking the propensity for smearing, oozing, electromigration and nodule formation comprising: a substrate; a spin valve type sensor element formed on said substrate; a laminated hard magnetic underlayer comprising a Ta/Cr seed layer upon which is formed a layer of hard magnetic material formed on said sensor element; an “interrupt” layer formed on said underlayer, said interrupt layer having an amorphous structure and orienting the crystal plane of a subsequently formed layer; a conductive lead layer formed over said “interrupt” layer and having its crystalline axes oriented thereby, wherein the conducting lead layer is a three layer lamination consisting of a first layer of NiCr, upon which is formed a layer of conducting material, upon which is formed a second layer of NiCr, the interfaces between the NiCr and the conducting material causing specular reflection of conduction electrons so as to enhance the sheet conductivity of the formation.