Inductive write head having high magnetic moment poles and low magnetic moment thin layer in the back gap, and methods for making

A method for constructing an inductive write element for use in a magnetic data storage system, comprising the steps of:

• a. forming a first pole, constructed at least partially of a high magnetic moment material, said first pole having a back gap portion and an opposite write gap portion;
• b. depositing a first layer of dielectric material onto said first pole, leaving said back gap portion uncovered;
• c. masking said dielectric material using a photolithographic process to leave said back gap of said first pole exposed;
• d. plating a material having a magnetic moment lower than that said high magnetic moment material of said first magnetic pole onto said masked surface;
• e. removing said mask, leaving said back gap plated with said material having a magnetic moment lower than that of said high magnetic moment material of said first magnetic pole;
• f. forming an electrically conductive coil having a plurality of winds a portion of which pass over said first pole between said pole tip and said back gap;
• g. depositing a second layer of dielectric material leaving said back gap uncovered;
• h. forming a second pole, constructed of a magnetic material, onto said second insulation layer and over said first pole and contacting said first pole in said back gap.

An inductive write element for use in a magnetic data storage system, comprising:

• a. a substrate
• b. a magnetic yoke primarily constructed of a high magnetic moment material, said magnetic yoke including lower and upper poles separated from one another at a first end of said yoke and joined to one another at a second end of said yoke said yoke defining an open interior between said lower and upper poles between said first and second ends, said lower pole being situated more closely than said upper pole to said substrate;
• c. an electrically conductive coil, passing through said open interior of said magnetic yoke and being electrically isolated said magnetic yoke;
• d. a layer of dielectric material separating said lower and upper poles from one another at said first end;
• and wherein
• e. said yoke includes a thin layer of material having a magnetic moment lower than that of said high magnetic moment material of said first lower magnetic pole.