An analytical design theory for field-access bubble domain devices

This paper describes the derivation and applications of an analytical model for magnetic bubble domain propagation. A fleld-access bubble device is treated as a magnetic circuit, emphasizing fluxes rather than fields as in most previous treatments. The energy changes are calculated within the bubble domain rather than in the propagation pattern, making possible a simple analytical-graphical process for predicting device operating margins. Agreement with a large number of device experiments is shown to be good. Closed-form expressions are derived which relate the essential features of the operating margin to device geometry and bubble material magnetic properties. The application of this model to device diagnosis, optimization, and scale down is discussed.