Browse Prior Art Database

High Resolution, Electrically Adjustable MR Read Head

IP.com Disclosure Number: IPCOM000083477D
Original Publication Date: 1975-May-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Mazzeo, NJ: AUTHOR

Abstract

At present, unshielded magnetoresistive (MR) heads consist of a single magnetoresistive stripe positioned vertically above the stored bit on the disc. Such a head is adequate for reading low density magnetic information, but suffers from adjacent bit interference when attempting to read high density recorded magnetic information.

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High Resolution, Electrically Adjustable MR Read Head

At present, unshielded magnetoresistive (MR) heads consist of a single magnetoresistive stripe positioned vertically above the stored bit on the disc. Such a head is adequate for reading low density magnetic information, but suffers from adjacent bit interference when attempting to read high density recorded magnetic information.

What is proposed is a three stripe structure for a read head as illustrated having stripes Ra, Rb and Rc made of magneto-resistive NiFe material of approximately 200 Angstroms thickness, separated by thin insulation material. The center distance d between the stripes is approximately 0.5 micron. The stripes Ra, Rb and Rc are interconnected so that the center stripe voltage signal will subtract from the adjacent stripes. The output signal obtained from such head structure is indicated upon review of he circuit connections illustrated.

Advantages of such a structure are increased resolution and electrical adjustability of such resolution and sensitivity. One of the most important features is that such a device provides a temperature compensated structure which tracks thermally.

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