EAPSI: Making small, low loss, metallic-magnetic heterostructures for next generation devices

EAPSI：为下一代设备制造小型、低损耗、金属磁性异质结构

• 批准号: 1415072
• 负责人: Nicholas Anderson
• 金额: $ 0.51万
• 依托单位: Anderson Nicholas R
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-06-01 至 2015-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1415072&HistoricalAwards=false
• 关键词: EAPSI; Making; small; low; loss

Magnetic systems are valuable in the microwave frequency range for a number of device applications useful for many communications and radar systems. Applications include isolators and other signal processing devices. Isolators specifically necessitate magnetic materials to create nonreciprocal propagation, i.e. a signal is allowed to propagate in one direction through a signal line but the reverse direction is blocked. Decreasing the size of the signal line components is necessary to move toward microchip production of components. One of the limitations to decreasing the size of the magnetic components is the large power losses inherent in metallic structures. There have been a number of proposals to limit the power losses in small magnetic systems including using non-metallic magnets. This project will model a structure with a grating of metallic-magnetic and non-metallic materials to decrease power losses. The magnetic structure will be fabricated at Dr. Adeyeye's lab at the National University of Singapore, one of the leading labs for magnetic nanofabrication, and experimental measurements will be taken. Experimental and theoretical results will then be compared.Metallic films generate eddy currents in the presence of microwave fields. By using a grating rather than a continuous metallic film eddy current losses can be significantly reduced. The goal of this project is to develop a theoretical model using analytical techniques as well as numerical simulations, such as effective medium theory and finite element modeling, to predict the effect of adding a dielectric and metallic-magnetic grating structure into a waveguide. A number of different orientations of grating, magnetization direction and polarization will be analyzed and optimized for nonreciprocal propagation with low losses. This NSF EAPSI award is funded in collaboration with the National Research Foundation of Singapore.

磁性系统在微波频率范围内对于许多通信和雷达系统有用的许多设备应用是有价值的。应用包括隔离器和其他信号处理设备。隔离器特别需要磁性材料来产生非互反传播，即允许信号通过信号线在一个方向上传播，但相反的方向被阻挡。减小信号线元件的尺寸是实现元件微芯片生产的必要条件。减小磁性元件尺寸的限制之一是金属结构固有的巨大功率损耗。有许多建议限制小型磁性系统的功率损耗，包括使用非金属磁铁。这个项目将模拟一个由金属磁性和非金属材料组成的光栅结构，以减少功率损耗。这种磁性结构将在阿德耶博士位于新加坡国立大学的实验室制造，该实验室是磁性纳米制造领域的领先实验室之一，并将进行实验测量。然后将实验和理论结果进行比较。金属薄膜在微波场的作用下产生涡流。通过使用光栅而不是连续的金属薄膜，涡流损耗可以显著减少。本项目的目标是建立一个理论模型，利用分析技术和数值模拟，如有效介质理论和有限元建模，来预测在波导中添加电介质和金属磁光栅结构的效果。本文将分析和优化多种不同的光栅取向、磁化方向和极化，以实现低损耗的非互易传播。该奖项由美国国家科学基金会与新加坡国家研究基金会共同资助。