Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Magnetic Bubble Sensing

IP.com Disclosure Number: IPCOM000074172D
Original Publication Date: 1971-Mar-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Bailot, NP: AUTHOR [+4]

Abstract

This magnetic domain device includes a platelet 1 of orthoferrite or like material. A series of conductor loops 2, 3 and 4 are arranged so as to be successively pulsed to thereby propagate a magnetic bubble 5 through successive positions A, B and C. In order to sense the presence and absence of a bubble 5 being propagated through the series, a second bubble 6 is held by a holding loop 7. When bubble 5 moves into position B, the interaction of the magnetic fields of bubbles 5 and 6 repels bubble 6 to position D located between two permalloy bars 8 and 9. After bubble 5 is moved to position C, loop 7 can be pulsed to shift bubble 6 back from position D to within the loop.

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 72% of the total text.

Page 1 of 2

Magnetic Bubble Sensing

This magnetic domain device includes a platelet 1 of orthoferrite or like material. A series of conductor loops 2, 3 and 4 are arranged so as to be successively pulsed to thereby propagate a magnetic bubble 5 through successive positions A, B and C. In order to sense the presence and absence of a bubble 5 being propagated through the series, a second bubble 6 is held by a holding loop 7. When bubble 5 moves into position B, the interaction of the magnetic fields of bubbles 5 and 6 repels bubble 6 to position D located between two permalloy bars 8 and 9. After bubble 5 is moved to position C, loop 7 can be pulsed to shift bubble 6 back from position D to within the loop.

To sense bubbles at B and within loop 7, four curved segments 10-13 of magneto resistive material are located at loops 3 and 7. Segments 10-13 are each curved to increase resistive changes therein due to the increased linkage with the flux of a bubble. Such increases are measured relative to those which would otherwise be obtained using straight sense bars.

Segments 10-13 are formed on platelet 1 and are interconnected to form a bridge circuit, as shown. This circuit further includes resistors 15 and 16 which forms a balancing network used to eliminate imbalance in the bridge caused by any tolerance variations in the segments. An external voltage is applied to terminals 17 and any imbalance in the circuit is detected by sense amplifier 18.

In operation, if a voltage is appl...