Chevron detector expander for magnetic bubble domain system

Abstract

A magnetic bubble domain system including a layer of magnetic material in which magnetic bubble domains can be propagated and a bubble domain guide structure coupled to the layer for defining first and second channels for the movement of domains. The bubble domain is injected from the first channel into the second channel at a point where the end of the domain does not experience the isolated end of an element of the guide structure. One implementation of this structure is an arrangement of guide structures so that the direction of propagation in the first channel is substantially perpendicular to the direction of propagation in the second channel. The second channel is formed by a pattern of magnetically operative discrete elements, typically including a plurality of groups of closely spaced chevron elements, each chevron element having a first end portion, a center portion, and a second end portion, the respective center portions of the chevron elements in one column being disposed on an axis, the axes of each of the groups being disposed parallel to one another. The second channel operates as a bubble expander structure for bubble detection.