Magnetostatic Modes and Losses in Planar Microwave Ferrites with Inhomogeneous Magnetization Distribution

项目负责人：Martha Parvidi-Horvath/ George Washington University头衔：职业进阶奖：平面微波铁氧体的静磁模式和损耗具有非均匀磁化分布。项目负责人在磁性和磁性材料方面的研究将延伸到微波现象和测量，以及单片微波集成电路（mmic）中的微波磁性。mmic的一个关键问题是，当电路尺寸变小，并且需要在更高频率下工作时，电路中的铁氧体器件的性能将被研究。铁氧体环行器的性能在很大程度上取决于铁氧体厚度，这是已知的，但不理解。本课题将对具有非均匀磁化分布的平面铁氧体微波谱中的静磁模式进行解析和数值计算。通过测量一系列厚单晶铁氧体薄膜的铁磁共振谱的厚度依赖性来检验理论工作的有效性。研究结果将透过期刊出版、参加会议、发展本科研究计划和修订实验课程（包括微波磁学）来传播。

Proposal Number: ECS-9707859 Principal Investigator: Martha Parvidi-Horvath/ George Washington University Title: Career Advancement Award: Magnetostatic modes and losses in planar microwave ferrites with inhomogeneous magnetization distribution An extension of the Principal Investigator's research in magnetism and magnetic materials to microwave phenomena and measurements, and microwave magnetism in monolithic microwave integrated circuits (MMICs) will be performed. A key problem in MMICs, the performance of the ferrite devices within such circuits as the circuits become smaller in size, and as they are required to operate at higher frequencies, will be investigated. It is known but not understood that the performance of the ferrite circulator within the MMIC depends very strongly on the ferrite thickness. The Principal Investigator will calculate analytically and numerically the magnetostatic modes in the microwave spectra of planar ferrite with inhomogeneous magnetization distribution. The validity of the theoretical work will be also checked by measuring the thickness dependence of the Ferromagnetic Resonance Spectra of a series of thick single crystal ferrite films. The results will be disseminated through journal publications, conference participation and the development of an undergraduate research program and revised laboratory course which includes microwave magnetism.