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Magnetic Recording Head

IP.com Disclosure Number: IPCOM000075920D
Original Publication Date: 1971-Dec-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Kehr, WD: AUTHOR [+2]

Abstract

This process permits fabrication of a plurality of magnetic read/write heads, utilizing both foil components and plating techniques. The magnetic poles are formed of high-permeability permalloy foil or other suitable magnetic foil material. The conductors are made of plated copper or other nonmagnetic high-conductivity material.

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Magnetic Recording Head

This process permits fabrication of a plurality of magnetic read/write heads, utilizing both foil components and plating techniques. The magnetic poles are formed of high-permeability permalloy foil or other suitable magnetic foil material. The conductors are made of plated copper or other nonmagnetic high- conductivity material.

The process consists of the following small number of steps: Step 1) Magnetic foil is coated with a conductive layer by by electroplating,

vacuum deposition, or similar plating techniques which

allow uniform deposition and controlled thicknesses.

Step 2) The pattern shown at this step is formed by standard photoetching techniques,

techniques, although other techniques, although other

techniques, such as electrical discharge machining, laser

or electron beam cutting, or others would be suitable.

Step 3) Next, a second layer of magnetic foil is laid over the etched material, as shown.

Step 4) Subsequently, the sandwich structure is heated to both anneal and diffusion

bond the parts, placed in a suitable housing and

ground to provide separation of the heads.

Additional steps, such as providing for back-gap closure, and insulating and diffusion inhibiting layers can be carried out to provide other desired results.

The thickness of the magnetic foil typically lies between one-half and five mils, while the thickness of the conductor may range from about 30 to 100 microinches, depending upon the function the head is to p...