U.S. Philips Corporation

Klaas L Van Mierloo

Jan Haisma

Ulrich E Enz

Piet F Bongers

Evert H Dekker

A magnetic device comprising at least one thin domain layer of a magnetizable material which has an easy axis of magnetization which is substantially normal to the surface of the layer and in which magnetic domains are propagated under the influence of a bipolar current, for example an alternating current, by a pattern of electrically conductive material with which the layer is provided. Elements are furthermore present which cause an asymmetry force and thus determine the direction in which the domains are propagated. The electrically conductive material and the elements are present in a single pattern which is constructed from at least a layer of magnetic material.

Magnetic domain device

A device for storing digital information in the form of magnetic domains including at least two ferrimagnetic layers on a substrate. The ferrimagnetic layers are separated by a compensation wall and in the presence of a bias magnetic field single magnetic domains and superposed magnetic domain pairs, the superposed domains being separated by a compensation wall, are generated. All single and superposed domains are mutually repulsive. The domains within a superposed pair are attracted to each other. The generated domains are propagated to a shift register and when the reigster is filled a row of domains is coincidentally propagated, transversely out of the register, to a domain array region adjacent the register. Rows are then propagated through the array region to a second shift register where they are individually detected and annihilated. A control device assures the proper working relationship between all elements.

Device for close-packed magnetic domains

A magnetic bubble device comprising a non-magnetic substrate layer, and a sequence of magnetic layers joined to each other and to the magnetic substrate layer, e.g. by epitaxial growing of crystalline layers, whereby at least two of the magnetic layers may accommodate magnetic bubbles which are stably joined through an interlayer magnetic compensation wall, or by an essentially finite potential barrier.

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Eindhoven, Netherlands

Klaas L Van Mierloo