Submicron bubble domain device design

The problem of scaling down existing permalloy pattern designs to be compatible with materials supporting micron and submicron bubbles is examined with the aid of a magnetostatic energy model. Using the model it is shown that the minimum drive field requirements are in general proportional to the garnet Saturation magnetization Msindirectly as a result of the bubble-bubble interaction. Under special circumstances the minimum drive field requirements can be independent of Mssuch as for propagation around a disk. In such a case the margin for propagation is proportional to the in-plane rotating field resulting in characteristically different behavior than obtained for a typical propagation pattern.