Microwave Circulators Based on Magnetostatic Waves

摘要本研究的目的是设计、制造和测试工作在5 ~ 50ghz波段的以静磁波为主要能量传输机制的微波环行器。这将允许总器件尺寸为1微米或更小，与标准微电子工艺进行竞争性集成。该方法有三个方面：1)将开发一个简化的数值模型（即格林函数或积分方程）；2)将为低导电性稀磁性半导体材料创建新的材料加工技术；3)将制造直流偏置电路。提出的活动旨在显著改变微波铁氧体环行器的设计方法以及通信/雷达系统的功能。静磁波现象将显著改变对非互易器件操作的看法，并承诺在比目前使用的更小的结构中扩展带宽的非凡结果。除了这些明确的结果之外，拟议的研究预计将提供与稀磁性半导体材料的磁电半导体效应相关的新应用和现象的一瞥；新的理论、模型和设备有望出现。拟议的活动将静磁波现象和稀磁半导体材料制造发现与重要的教学，培训和学习活动结合起来。特别是，代表性不足的本科生和研究生将尽可能参与拟议的研究。此外，K-12学生将通过演讲、研讨会和实验室参观参与。计划在顶级同行评议期刊上发布研究结果；中期结果将通过会议和专题讨论会向国际社会介绍。

AbstractThe objective of this research is to design, fabricate and test microwave circulators that operate in the band between 5 and 50 GHz utilizing magnetostatic waves as the dominant energy transport mechanism. This will allow total device sizes of 1 µm or less for competitive integration with standard microelectronic processes. The approach is threefold 1) a simplified numerical model (i.e., Green's function or integral equation) will be developed 2) new materials processing techniques will be created for low conductivity dilute magnetic semiconductor materials and 3) dc bias circuitry will be fabricated.Intellectual Merit The proposed activity aims to dramatically change microwave ferrite circulator design approaches as well as communication/RADAR system functionality. Magnetostatic Wave phenomena will significantly change perspectives on nonreciprocal device operation and promises the extraordinary outcome of expanded bandwidths in smaller structures than are currently employed. In addition to these explicit outcomes, the proposed research is expected to provide glimpses of new applications and phenomena associated with magnetoelectric semiconducting effects of dilute magnetic semiconductor materials; new theories, models and devices are expected.Broader Impacts The proposed activities integrate magnetostatic wave phenomena and dilute magnetic semiconductor material fabrication discoveries with significant teaching, training and learning activities. In particular, underrepresented undergraduate and graduate students will participate in the proposed research wherever possible. Also, K-12 students will be included via presentations, workshops and laboratory tours. Results are planned for dissemination in top-tier peer-reviewed journals; intermediate results will be presented to the international community through conferences and symposia.