SBIR Phase I: Electromagnetic Pulse Sensors Based on Magnetic Nanowire Arrays

这个小型企业创新研究(SBIR)第一阶段项目旨在开发能够检测电磁脉冲(EMP)磁场的新型场探测器和存储设备。该传感器由镶嵌在绝缘矩阵中的磁性纳米线组成的磁性纳米线阵列组成，能够存储输入的短至100ps的射频磁场脉冲，并能在场强高达2 mV/m的极端电磁脉冲环境中生存。由于采用被动工作模式，它可以在没有电力的情况下记录射频场。然后，可以在加电阶段读出记录的信号。该材料系统还显示了其他有趣的现象，如铁磁谐振(FMR)频率可调。这项研究的目的是论证利用磁性纳米线阵列来检测电磁脉冲的概念。具体来说，将解决场探测器在微波场中的稳定性和响应时间等问题。该项目的更广泛的影响/商业潜力源于磁性纳米线阵列所展示的丰富现象，每一种现象都导致了一类应用。记忆效应？导致EMP传感器和在射频识别(RFID)应用中的潜在应用。可调谐FMR功能可用于构建可调谐的射频环行器/隔离器和电磁干扰(EMI)屏蔽。在GHz范围内的高磁导率可以作为天线基板，在其上可以制造小型化的天线。

This Small Business Innovation Research (SBIR) Phase I project aims to develop novel field detectors and memory devices capable of detecting magnetic field of an electromagnetic pulse (EMP). The sensor is made of magnetic nanowire arrays consisting of magnetic nanowires embedded in an insulating matrix, and is able to memorize the incoming rf magnetic field pulse as short as 100ps andsurvive in an extreme EMP environment with fields as large as 2MV/m. Due to the passive operation mode, it can record rf field without electrical power. The recorded signal can then be read out during the power-on stage. The material system also shows other interesting phenomena such as tunableferromagnetic resonant (FMR) frequency. The objective of this research is to demonstrate the concept of using magnetic nanowire arrays to detect EMP. Specifically, issues including the stability of field detector in a microwave field and the response time will be addressed.The broader impact/commercial potential of this project arises from the rich phenomena exhibited by the magnetic nanowire array, each leading to a class of applications. The ?memory effect? leads to EMP sensors and potential applications in radio frequency identification (RFID) applications. Thetunable FMR feature can be used to construct tunable rf circulators/isolators and electromagnetic interference (EMI) shielding. The high magnetic permeability in GHz range can be used as antenna substrates on which miniaturized antenna can be fabricated.