Abstract
Whereas ferromagnetic and spin-wave resonance in single-layered films has been studied for a number of years,1 the study of such resonances in multilayer films is still at its infancy. Before the multilayer films can be used in possible applications, it is necessary to understand their superlattice properties. We have used FMR techniques to determine the basic parameters of these films, both theoretically and experimentally. Theoretically, we have calculated the FMR spectra for superlattices of single-crystal, polycrystal, and amorphous samples. Experimentally, we have studied ferromagnetic and spin-wave resonances in Fe/SiO2/Fe/SiO2 . . . , Fe/Co/Fe/Co . . . , NiFe/SiO2/NiFe/SiO2 . . . , and NiFe/Co/NiFe/Co . . . samples. It was found theoretically and experimentally that for applied fields parallel and perpendicular to the film plane, the internal fields in various layers may differ. This could result in widely separated resonances for the various layers. In the case of ferromagnet/insulator multilayered samples, the FMR spectra depended critically on the insulator thickness and its degree of perfection. Diffusion of ferromagnetic atoms through pinholes in the insulating layer provided exchange coupling between ferromagnetic layers and the FMR spectra appeared similar to samples without insulating layers.
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