Repulsive interactions between magnetic bubbles: Consequences for bubble devices

Experiments and calculations are reported about some aspects of the repulsive interactions of cylindrical magnetic bubble domains. Experiments were done on hexagonal lattices of bubbles in which, for one case, the stable positions of the bubbles were determined by a Permalloy overlay. The calculations refer to different structures and Show that from a point of view of bubble interactions the maximum bubble density for a square lattice is almost the same as for a hexagonal lattice. It is also shown that a preferred thickness of the bubble material sheet exists.