Generator for magnetic domains

Abstract

A source of magnetic bubbles comprises a plate of magnetic material which is situated in a principal magnetic field directed transverse to the plate, a loop conductor having an inner side and an outer side which are defined as such and in which alternately directed current pulses can be generated, and also comprising a first and a second preferred structure. The preferred structures project as far as inside the loop conductor. On the first preferred structure a magnetic bubble remains which, under the influence of a first current pulse in the loop conductor which attenuates the magnetic field, expands such that the second preferred structure is also covered. After termination of the first current pulse an oppositely directed second current pulse is applied, with the result that the principal magnetic field is intensified, the bubble is split, and each part thereof remains bound as a bubble to one of the two preferred structures, the bubble situated on the second preferred structure being driven out of the conductor loop in a reversible manner, inter alia under the control of the repulsion existing between the bubbles. After termination of the second current pulse, the bubble situated on the first preferred structure occupies a preferred position which is at least partly situated inside the loop conductor, and this bubble can be split again by a next pair of current pulses. The second preferred structure forms part of a path which comprises an element which extends without interruption in the longitudinal direction.