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Tecsi (techniques Et Systemes Informatiques)

Techniques Et Systemes Informatiques

Claude Battarel

Robert Morille

Jean-Pierre Nori

Brigitte Bedene

The register comprises a soft magnetic layer in which is formed the domain propagation channel, a hard magnetic layer and a domain shift conductor. The propagation channel comprises a writing box, a reading box, narrow domain storage zones, widened domain growth boxes, a domain increasing zone, upstream the reading box, which includes intermediate domain increasing boxes, which have a large surface with respect to that of the other growth boxes. Each increasing box comprises lateral shoulders and is not covered by the shift conductor. A coil or a solenoid creates at the level of the increasing zone and of the reading box, a pulsating external magnetic field.

Shift register for magnetic domain propagation memory

Magnetic memory element for transport ticket or credit card, comprising a support and at least one ferromagnetic layer containing at least one piece of information recorded therein and a layer of a non-magnetic diffuser in contact with the ferromagnetic layer to irreversibly destroy the magnetism of the ferromagnetic layer when the element is heated.

Heat-destructible magnetic memory element

A magnetic domain propagation register carrying out the propagation of the domains under the effect of electric currents, comprising an insulating substrate, a soft magnetic layer on the insulating substrate, in which is formed a propagation channel, a hard magnetic layer on the soft magnetic layer, except in areas defining the propagation channel, an insulating layer on the soft and hard magnetic layers, and a conduction layer in a Greek border pattern on the insulating layer, constituted by parallel segments perpendicular to the propagation channel, the propagation channel comprising widened boxes at the intersection of the propagation channel with the segments of the conduction layer.

Magnetic domain propagation register

A magnetic domain propagation register carrying out the propagation of the domains under the effect of electric currents in a channel formed by an anisotropic soft magnetic substance strip layed out on an insulating substrate, the domain shift conductor, in the form of a Greek border pattern, being single and comprising a hard magnetic layer, an electricity conducting layer and conducting extra-thicknesses decentered in relation to the axis of the Greek border pattern, characterized in that the hard magnetic layer is placed at the base of said conductor, that another hard magnetic layer is coupled to said soft magnetic strip, and that said conducting extra-thicknesses overlap the edge of the Greek border pattern on the input side of the domains under said Greek border pattern.

Domain propagation register with single layer of conductors

In digital registers for the propagation of magnetic domains in thin layers, one of the shift conductors is combined with an extra layer which is magnetically hard and which sets up a permanent field on the edge of that conductor, this facilitating the propagation of the domains.

The invention comes within the field of digital memories having thin magnetic layers, for the propagation of domains. This memory is constituted by an anisotropic linear magnetic channel which is applied on a glass substrate and which has a single shift conductor in a Greek border configuration superimposed on it. Areas made of soft magnetic material are provided at the intersection between the channels and the conductors. According to such a structure, high-capacity shift registers which are of relatively rapid access (one shift step lasts about 500 nanoseconds) can be produced.

Register for the propagation of magnetic domains in thin magnetic layers

Reading unit for a shift register according to the thin magnetic layer technology. For reading, the magnetoresistance effect is used. According to the invention, an electrical conductor, which overhangs the propagation channel is interrupted at the central point of the reading unit and a hard magnetic layer whose magnetization is directed perpendicularly to the easy axis of the propagation channel is deposited at that point. That layer tends to align the magnetization of the channel with its own magnetization and makes it possible, in co-operation with an energizing conductor, to obtain a difference in the resistance of the reading unit between the two states of a digital data item.

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Magagnosc, France

Claude Battarel