Microwave and Millimeter Wave Magnetic Solitons and Chaos in Magnetic Thin Filmsand Thin Film Superlattices

摘要

The objectives of this program were (1) the experimental and theoreticalinvestigation of microwave magnetic envelope (MME) solitons, (2) the application of Brillouin light scattering (BLS) techniques to the study of nonlinear magnetic excitations in magnetic films, (3) the use of BLS techniques to understand the magnetic properties of magnetic thin film sandwiches and multilayers, and (4) the microwave/millimeter wave characterization of hexagonal ferrite materials. One personal objective was to reestablish a U.S. presence in (2) and (3). A wide variety of MME soliton phenomena were observed experimentally and modeled theoretically, including backward volume wave, forward volume wave, and surface wave dark solitons, multiple solitons, and soliton collisions. BLS techniques were used to characterize the critical modes for subsidiary absorption, parallel pumping, and resonance saturation spin wave instability processes in thin magnetic films. BLS techniques were also used to study magnetic excitations in Fe/Cr/Fe sandwich films as a function of field orientation and scattering configuration. The low power loss properties of hexagonal ferrite materials were characterized from 10 to 100GHz.