| High-frequency applications of magnetic materials-based devices are developed in this dissertation. This class of devices are unique for possessing an electronic tunability for very high carrier frequency with a large bandwidth. An ultrathin iron film on compound semiconductor substrate in various multilayer configurations has been prepared and demonstrated an important advantage over its YIG film-based predecessors. The product potential of this work is reflected in the realization of integrated wideband microwave magnetoelectronics components for communication and signal processing. The principle of operation based on the solution of Maxwell's equations in the magnetic medium is presented. A bandstop filter tunable over a 30 GHz bandwidth up to the millimeter-wave range and an adjustable phase shifter are designed and characterized. Device performance is compared to simulation results based on numerical calculation of transmission. |
