Browse Prior Art Database

Magneto Resistive Detector

IP.com Disclosure Number: IPCOM000077329D
Original Publication Date: 1972-Jul-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Walker, EL: AUTHOR

Abstract

This sensing scheme permits sensing a bubble without the interference of the propagation of a bubble along a T and I bar chain.

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Magneto Resistive Detector

This sensing scheme permits sensing a bubble without the interference of the propagation of a bubble along a T and I bar chain.

T bars 10a, 10b and I bar 12 are of thick permalloy, while the sensor comprises two thin permalloy strips 14a, 14b connected to a conducting loop formed of metal conductors 16a, 16b, I bar 12, and the two thin permalloy strips 14a, 14b. Under the influence of an inplane rotating H field 18, a bubble 20 enters the left T bar 10a and proceeds to position 2 on that T bar. After position
2. the bubble 20 leaves the T bar 10a and enters position 3 of the I bar 12. At the same time a sense current Is is passed through the current loop. The current Is is of sufficient magnitude to stretch the bubble 20 to the length of the permalloy sensors 14, providing a large sense voltage during the time the bubble is located at position 3. When sensing is complete, the sense current Is is brought down allowing the bubble to continue to position 4 at the right T bar 10b again under the influence of the rotating field 18.

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