U.S. Philips Corporation

Harm Marinus Booij

Willem Frederik Druyvesteyn

A magnetic device comprising at least one thin layer of a magnetizable material having a preferred direction of magnetization which is approximately perpendicular to the surface of the layer in which magnetic domains are generated, maintained and possibly annihilated in the layer. A domain guiding structure which with a given magnetic field substantially in the preferred direction enables the occurrence of two types of magnetic domains. The area of the largest domain is at least 15% and at most 125% larger than that of the other domains. The device also has means which convert one type of domain into the other type of domain.

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Eindhoven, Netherlands

Harm Marinus Booij