The nature of the coupling between magnetic excitations in two-layer epitaxial ferrite-garnet films

We investigate the interaction between the intrinsic ferromagnetic resonance modes of adjacent layers of a two-layer epitaxial structure by studying the gap between the resonance fields at the point of maximum interaction. We establish that one of the fundamental sources of coupling energy leading to the appearance of this gap is the nonuniform component of the exchange interaction energy. O I996 American Institute of Physics. [S 1063-776 1 (96)0130911