Browse Prior Art Database

Multielement Magnetoresistive Read Head Providing Enhanced Resolution

IP.com Disclosure Number: IPCOM000081220D
Original Publication Date: 1974-Apr-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Beaulieu, TJ: AUTHOR [+2]

Abstract

A multielement magnetoresistive (MR) read head for providing a slimmed signal, thereby improving resolution is illustrated. The head comprises four spaced permalloy shield elements 11, 12, 13 and 14 with an MR element 20, 21 and 22 between each pair of shields. A single bias current I(B) flows through the interconnected conductive shields, so as to bias the middle MR element in an "up" direction and the side MR elements in a "down" direction. The resultant signal sensed by the side elements 20 and 22 is accordingly opposite in polarity from that of the middle MR element 21, and of a lesser magnitude.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Multielement Magnetoresistive Read Head Providing Enhanced Resolution

A multielement magnetoresistive (MR) read head for providing a slimmed signal, thereby improving resolution is illustrated. The head comprises four spaced permalloy shield elements 11, 12, 13 and 14 with an MR element 20, 21 and 22 between each pair of shields. A single bias current I(B) flows through the interconnected conductive shields, so as to bias the middle MR element in an "up" direction and the side MR elements in a "down" direction. The resultant signal sensed by the side elements 20 and 22 is accordingly opposite in polarity from that of the middle MR element 21, and of a lesser magnitude.

Proper phasing of the three signals is achieved by selectively controlling the physical separation between the MR elements. By controlling the magnitude of the sense currents through the MR elements, the relative amplitude of the signals from the outer MR elements with respect to the middle MR element is controlled. Accordingly, by linear superposition of the three sensed signals, a slim composite signal is achieved.

1

Page 2 of 2

2

[This page contains 2 pictures or other non-text objects]