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

建议编号：ECS-9707859首席研究员：Martha Parvidi-Horvath/乔治华盛顿大学标题：职业进步奖：具有非均匀磁化分布的平面微波铁氧体中的静磁模式和损耗首席研究员在磁性和磁性材料方面的研究将扩展到微波现象和测量，以及单片微波集成电路(MMIC)中的微波磁性。MMIC中的一个关键问题是，随着电路变得更小，以及要求它们在更高的频率下工作，这种电路中的铁氧体器件的性能将被研究。已知但未被理解的是，MMIC内的铁氧体环行器的性能非常强烈地依赖于铁氧体厚度。主要研究人员将对磁化强度分布不均匀的平面铁氧体微波频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随厚度的变化，验证了理论工作的正确性。研究结果将通过期刊出版物、参加会议、制定本科生研究计划和修订实验室课程(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.