New Magnetic Materials and Phenomena for Radar and Microwave Signal Processing Devices - Bulk and Thin Film Ferrites and Metallic Films

摘要

ONR Grant ONR N00014-07-1-0597 has supported a four phase program. Under Phase (1), there were three materials thrusts, (a) hybrid pulse laser deposited and liquid phase epitaxy films of low loss cubic yttrium iron garnet (YIG) and uniaxial barium hexaferrite, (b) bulk and thick film ultra-dense fine grain pol crystalline YIG materials, and (c) high magnetization metallic films, notably of Permalloy, iron, and FeTiN. Under Phase (2), the focus was on magnetic loss properties, both on and away from the peak in the ferromagnetic resonance (FMR) response, and the change in the microwave response at high power. Under Phase (3), the Magnetics Laboratory at Colorado State University (CSU) worked with other colleagues and collaborators in sister ONR programs to combine the magnetic systems developed and characterized at CSU with ferroelectric films and systems to achieve new multifunctional properties. Under Phase (4), the unique expertise of the CSU facility in Brillouin light scattering was applied to ferrite film systems, among others, to study the basic linear and nonlinear magnetic excitation properties in delay line structures.