Analysis of nonuniformity of bubble propagation in field access systems

The static and dynamic properties of bubbles can be conveniently observed by using a mirror overlay between a drive structure and a thin ferro-garnet film. This method was applied to studies of bubble propagation in T-bar, T-X and chevron permalloy drive structures. The results of the study lead to the conclusion that a parameter a should be introduced for estimating the nonuniformity of bubble propagation. This parameter is found by photometric measurements of light intensity variations along the bubble propagation path over the structure period λ and by subsequent calculations.