Browse Prior Art Database

Passive Magnetic Domain Amplification

IP.com Disclosure Number: IPCOM000073948D
Original Publication Date: 1971-Feb-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Bosch, LJ: AUTHOR [+5]

Abstract

The drawing shows a circuit for sensing the presence or absence of a bubble 2 in a channel 3 of an orthoferrite wafer 4. Channel 3 connects to a channel 5. A sense winding 6 is located over channel 5 to define a sequence of bubble positions. Bubbles are initially located in alternate positions 7. These positions are close enough together that the motion of a bubble in one position is magnetically transferred to the adjacent bubbles to produce a wave motion of all of the bubbles in the channel. Thus, as bubble 2 is moved into a location 8 at the entrance of channel 5, the bubbles in position 7 transfer to the right successively into the vacant positions shown by dashed line bubbles.

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Passive Magnetic Domain Amplification

The drawing shows a circuit for sensing the presence or absence of a bubble 2 in a channel 3 of an orthoferrite wafer 4. Channel 3 connects to a channel 5. A sense winding 6 is located over channel 5 to define a sequence of bubble positions. Bubbles are initially located in alternate positions 7. These positions are close enough together that the motion of a bubble in one position is magnetically transferred to the adjacent bubbles to produce a wave motion of all of the bubbles in the channel. Thus, as bubble 2 is moved into a location 8 at the entrance of channel 5, the bubbles in position 7 transfer to the right successively into the vacant positions shown by dashed line bubbles. The motion of the bubbles past the sense wire 6 produces a succession of voltages that are significantly stronger and, therefore, easier to sense than in the conventional sensing of the single bubble. An exit channel 9 is provided for returning the sensed bubble to an associated circuit. A loop 10 is energized to return the bubbles to the position for a next sense operation.

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