Patent ID: 6767477
Filing Date: 2004-07-27
Classification: C23F,F16B,G11B,H05K,Y10T

Abstract:
A process for manufacturing a copper coil as part of a write-head for a magnetic disk system, comprising:providing a body of nickel-iron; depositing a layer of insulating material on said body; depositing a copper seed layer on the insulating layer; depositing a layer of photoresist on the seed layer and then exposing and developing the photoresist to form a pattern that defines said coil whereby the seed layer is exposed in areas that define the coil and covered everywhere else; by means of electroplating, increasing copper thickness in all the exposed areas; removing the patterned layer of photoresist; immersing the copper and the nickel-iron in an aqueous etching solution containing ammonium persulfate, at a first concentration, and 1,4,8,11 tetraazundecane at a second concentration, whereby said copper seed layer is removed, the coil is formed, and the nickel-iron is unaffected.