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Orthoferrite Logic Utilizing Surface Channels

IP.com Disclosure Number: IPCOM000073946D
Original Publication Date: 1971-Feb-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 3 page(s) / 33K

Publishing Venue

IBM

Related People

Bogholtz, WE: AUTHOR [+5]

Abstract

Part A of the drawing shows an orthoferrite device that performs the logical AND function on two logic variables, X and Y. The variables are represented by the presence or absence of a magnetic bubble at input channels 2 and 3. The channels are defined by etched lines 4 that extend in the direction of propagation of the bubbles. Wide lines 5 are located where the bubbles are urged against the channel walls. Cross-channel lines 6 are located to confine the bubbles to a particular point in the channel between changes in the magnetic fields that move the bubble. The bubbles are moved across lines 6 during individual phases of the operation.

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Orthoferrite Logic Utilizing Surface Channels

Part A of the drawing shows an orthoferrite device that performs the logical AND function on two logic variables, X and Y. The variables are represented by the presence or absence of a magnetic bubble at input channels 2 and 3. The channels are defined by etched lines 4 that extend in the direction of propagation of the bubbles. Wide lines 5 are located where the bubbles are urged against the channel walls. Cross-channel lines 6 are located to confine the bubbles to a particular point in the channel between changes in the magnetic fields that move the bubble. The bubbles are moved across lines 6 during individual phases of the operation.

In the first phase of the AND operation, any bubbles at inputs 2 and 3 are moved to the right to locations 7 and 8 where they are held by the cross-channel lines. The bubbles are moved by a gradient field with a short beginning pulse that drives the bubbles through the cross-channel lines. In the next phase of the operation, the bubbles are driven upward in the drawing. Any bubble at location 7 is held by the wide channel. If bubbles are located at both locations 7 and 8, their magnetic interaction prevents the bubble at location 8 from moving. If a bubble exists at location 8 but not at location 7, it is moved through the cross-channel line into location
7. Thus, at the end of this phase of the operation, the absence of the bubble at location 8 represents the function XY. Next, the magnetic field is oriented to drive bubbles downward in the drawing. Again, the presence of bubbles in both locations 7 and 8 prevents any bubble motion. The absence of a bubble at location 8 allows any bubble at location 7 to move to location 9 where it is held by a cross-channel line. Thus, at the end of this phase of the operation, a bubb...