Browse Prior Art Database

Control Field Conductor for Bubble Memory

IP.com Disclosure Number: IPCOM000075469D
Original Publication Date: 1971-Sep-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Fresia, JF: AUTHOR [+2]

Abstract

This is a magnetic domain propagation array whose conductor shape provides the necessary field gradients for domain propagation and its own return path such that the number of conductors in the array is reduced, fabrication of the array is simplified and the packing density is increased.

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Control Field Conductor for Bubble Memory

This is a magnetic domain propagation array whose conductor shape provides the necessary field gradients for domain propagation and its own return path such that the number of conductors in the array is reduced, fabrication of the array is simplified and the packing density is increased.

A sheet of magnetic material 10, as shown in Fig. 1, has two interleaved conductive patterns 12 and 14 deposited thereon. Each pattern 12 and 14, delineates a series of rectangular, open-ended, U-shaped loops which are formed with parallel legs 12a, 14a, 12b and 14b each of which contains a respective constricted region 12c, 14c, 12d and 14d.

When a domain 16 is introduced by known techniques into juxtaposition with region 12c, it can be propagated through the sheet 10, under the constricted regions, by applying selected alternating-current pulses to each pattern.

When the applied current to pattern 12 is such that during the first half-cycle,
i.e., the negative half of pulse 18a of Fig. 2a, the magnetic field around constriction 12c is such that the domain 16 experiences a push-pull effect and moves under the constriction 12c. During the positive half of cycle of pulse 18a, the current through the constriction reverses causing a reversal of the magnetic fields around the constriction 12c, and the domain 16 again experiences a push- pull effect that drives it into the region between constrictions 12c and 14c.

When a reversed alternating p...