Influence of the Resonant Magnetoacoustic Interaction of Exchange Magnetostatic Waves on the Spectrum of Dipole Magnetostatic Waves in Ferrite Films with Arbitrary State of Surface Spins

摘要

The influence of the resonant magnetoelastic interaction of exchange magnetostatic waves (MSWs) with acoustic waves (AWs) on the spectrum of dipole MSWs in Iron-Yttrium-Garnet (IYG) films with an arbitrary degree of surface pinning are investigated experimentally. It is shown that, in a narrow range of the dipole MSW spectrum specified by the excitation frequency, the MSW spectrum undergoes a strong restructuring caused by a resonant coupling of the exchange phase-synchronized MSWs with AWs. This coupling of exchange MSWs with AWs is so strong that, for higher-order exchange modes. the spatial distribution of eigenoscillations of magnetization and elastic medium is not anti-symmetric with respect to thickness, as it occurs in a standard situation for exchange MSWs in films with free surface spins. As a result, the excitation of exchange MSWs and hybrid dipole-exchange MSWs in films with free surface spins becomes possible; when magnetoelastic interaction in these films is absent, the purely dipole MSW spectrum is observed.