Browse Prior Art Database

Magnetic Steeror

IP.com Disclosure Number: IPCOM000098491D
Original Publication Date: 1960-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Stuckert, PE: AUTHOR

Abstract

Logic is performed by domain wall propagation in magnetic films or tapes by steering the direction of propagation.

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Magnetic Steeror

Logic is performed by domain wall propagation in magnetic films or tapes by steering the direction of propagation.

The device is an element 10 made of magnetic film or tape having a main portion 11 and auxiliary portions 12 and 13 suitably mounted on a substrate 14. A control winding 15 couples both portions 12 and 13 in an opposite sense and connects to a control circuit 16. Operation is based on the steering of domain wall propagation to either portion 12 or portion 13, depending on the polarity of current provided in winding 15 by circuit 16.

Initially, a reset field is applied to orient the magnetization of element 10 from right to left. After reset, a small bias field, insufficient to cause switching, is applied to 10 in a direction from left to right. By a coil (not shown), switching is nucleated in 10 to the left of a and propagates from left to right in the presence of the bias field. Winding 15 is then energized to establish local fields in 10 at b. As a function of the polarity of the control current, switching is propagated in one portion 12 or 13 and inhibited in the other. Pick-up coils (not shown), located to the right of c, detect switching in leg 12 or leg 13. The output of 16 represents the logical variable A and voltages induced in the pick-up coils represent A in one coil and bar A in the other.

The preferred mode of wall motion propagation VW for a single strip of magnetic material is angular rather than vertical (a = 90 degre...