Patent ID: 6345435
Filing Date: 2002-02-12
Classification: G11B,Y10T

Abstract:
A method of forming a laminated yoke, comprising:providing a base, wherein said base comprises a ferromagnetic pole piece and a ferromagnetic back gap piece; plating a full film layer of a first ferromagnetic material on said base, wherein said layer of said first ferromagnetic material contacts said pole piece and said back gap piece; forming a patterned layer of a first non-magnetic dielectric on said layer of first ferromagnetic material wherein said patterned layer of first non-magnetic dielectric does not cover that part of said layer of said first ferromagnetic material over said ferromagnetic pole piece and over said ferromagnetic back gap piece; forming a patterned layer of photoresist over said layer of first ferromagnetic material and said patterned layer of first non-magnetic dielectric; forming a patterned layer of a second ferromagnetic material over said layer of first ferromagnetic material and said patterned layer of first non-magnetic dielectric using frame plating, and said patterned layer of photoresist as a frame for said frame plating, wherein said patterned layer of second ferromagnetic material contacts that part of said layer of first ferromagnetic material over said ferromagnetic pole piece and over said ferromagnetic back gap piece; removing said patterned layer of photoresist; and patterning said layer of first ferromagnetic material using ion beam etching and said patterned layer of second ferromagnetic material as a mask.