Observation of the radial oscillation of a bubble lattice

The radial oscillation of bubble lattices in LPE garnet films has been measured as a function of static fields applied perpendicular to the film or in the film plane, using a simple RF technique. While the dependence of the measured resonance frequency on the normal field can be described by theory, the measured frequency increases more rapidly with the in-plane field than calculated; this discrepancy is probably due to an incorrect theoretical dependence of the wall mass on the in-plane field.