Patent ID: 6632474
Filing Date: 2003-10-14
Classification: B82Y,G11B,H01F

Abstract:
A method for forming a thin conductive 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:providing a laminated hard magnetic underlayer comprising a seed double layer of Ta/Cr, upon which is formed a layer of the hard magnetic material CoPtCr or CoPt; forming over said underlayer an â€œinterruptâ€  layer said layer being a layer of Ta having an amorphous structure and designed to orient the crystal plane of a layer formed upon it in a direction parallel to the plane of that layer; forming over said â€œinterruptâ€  layer a conductive lead layer having said properties of high hardness, high melting point high corrosion resistance and lacking the propensity for smearing, oozing, electromigration and nodule formation said lead layer being a three layer lamination comprising a first layer of NiCr, upon which is formed a conducting layer of Ru, Rh or Ir, 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.