Magnetic bubble domain devices

A review is given of recent advances which have been made in the area of magnetic bubble domain devices with emphasis being placed on new device components and the problem of device optimization. The subject of bubble domain propagation is introduced by considering the results obtained on the basis of a simplified model which is applied to individual bars and bar pairs to illustrate the basic principles involved in field access drive circuits. Experimental data is presented which qualitatively confirms various aspects of the model. New device component designs are then introduced, such as the multiple-bar keyhole generator and the chevron stretcher detector, in which bubble stretching occurs orthogonal to bubble motion. Preliminary data on these as well as on various other circuit components are presented and discussed in the light of future device applications.