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Modified Magnetoresistive Head

IP.com Disclosure Number: IPCOM000079944D
Original Publication Date: 1973-Oct-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Bajorek, CH: AUTHOR [+3]

Abstract

A recording head using a magnetoresistive sensing element is protected from failure, due to contamination arising out of the contact of a metallic conductor with the magnetoresistive sensing element of the head.

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Modified Magnetoresistive Head

A recording head using a magnetoresistive sensing element is protected from failure, due to contamination arising out of the contact of a metallic conductor with the magnetoresistive sensing element of the head.

The drawing illustrates a recording head made by thin film techniques, wherein the permalloy sensing strip 2 would normally be in contact with two copper or gold strips 4 and 6 which carry signal current from strip 2. It has been found that such direct contact, when exposed to corrosion conditions, causes an accelerated mode of failure due to an electrochemical couple (Cu+NiFe). Additionally, the conductor metals can diffuse and migrate into the sensing element, so as to destroy the desired characteristics of such sensing element.

By interposing short strips 8 and 10 of nickel or nickel-iron between the copper and the permalloy sensing strip, such contamination is avoided, resulting in an increase in the life of the sensing head. The junction of dissimilar metals can be recessed into a region less susceptible to the corrosive environment. The interposed strips can be much thicker than the sensing element and thus inhibit this mode of failure. These interposed strips can be made magnetically inert (for example, by oxidizing them) where the highest value of stray magnetism in the vicinity of the sensing head will have no effect upon them.

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