Proximity and interaction effects in arrays of I-bars

Calculations have been made of interactions and fields in two-dimensional periodic arrays of I-bars. The results of the study shed light on several questions of interactions among bubble propagation elements. We have calculated interaction effects in arrays of I-bars as a function of both longitudinal and transverse spacing between bars. Three different geometries of I-bar show similar effects; the transverse and longitudinal interactions have opposing signs and are stronger in the transverse direction. We also have calculated local and average fields for an array of I-bars of geometries chosen to facilitate comparison with recent measurements. The local field in the gap between elements is found to be highly nonuniform but with an average value that obeys a simple relationship as the gap length is varied. The field profile is also nonuniform in the transverse direction, and exhibits a proximity enhancement that depends upon gap dimension. These results support the interpretation that bar-bar interactions can influence the magnetization in propagation arrays.