Domain-wall oscillation of bubble and stripe lattices in hexagonal ferrites

Abstract

The wall resonance frequencies of bubble and stripe lattices in the hexagonal ferrites BaFe12O19 and PbFe12O19 have been measured as a function of crystal thickness and magnetic fields applied parallel and perpendicular to the c axis, which is oriented normal to the crystal surface. The dependence of the resonance frequencies on the normal field is in agreement with theory. For the dependence on the in-plane field, however, a similar deviation between theory and experiment occurs, as is observed in garnet bubble materials; furthermore, the resonance frequencies increase stronger with decreasing thickness of the crystals than is predicted by theory.