ACT/SGER: Enhancement of Magnetically-Transduced Surface Acoustic Wave Sensors

该项目旨在展示远程化学和生物传感器系统的潜在突破性概念。该方法是探索当铁磁薄膜中单个磁矩的谐振进动频率与磁致伸缩换能器的表面声波谐振频率相同时获得增强磁-力耦合的可能性。如果可行，这将大大提高用于远程探测化学/生物威胁的磁转导表面声波装置的可行性。这种装置的制造与传统的集成电路处理是兼容的，因此，装置阵列可以与晶体管电子元件集成在单个芯片上，从而制造出一种多功能、廉价的远程化学检测系统。通过测量具有固定声共振频率的磁条结构的超高频（UHF）复磁导率来表征谐振进动（铁磁共振）与声共振之间的相互作用，并改变进动共振随外加磁场的变化。所使用的结构、材料和场将产生1 MHz - 1 GHz范围内的共振。谐振进动与谐振表面声波的耦合以前还没有被探索过，除了传感器应用之外，还可能导致对磁性材料，特别是磁阻尼的超高频特性的新见解。这个项目的一个重要特点是教育和培训，强调研究和教育的结合。该基金资助的研究生将为开发和表征用于化学/生物传感应用的新型磁性器件奠定基础。此外，本科生将在PI的实验室从事与这项研究工作相关的项目，并获得在最先进的环境中进行研究的第一次经验。此外，PI将通过nsf资助的康奈尔材料研究中心以及工程学院赞助的其他活动参与外展活动，例如康奈尔大学工程研究（居里）学院，这是一个为高中女生提供探索工程职业机会的项目。该奖项由美国国家科学基金会和情报界共同支持。数学和物理科学理事会的反恐方法（ACT）项目支持基础研究和劳动力发展方面的新概念，这些新概念有可能有助于国家安全。

This project aims at demonstrating a potential breakthrough concept in remote chemical and biological sensor systems. The approach is to explore the possibility of obtaining enhanced magnetomechanical coupling when the resonant precession frequency of individual magnetic moments in a ferromagnetic thin film is identical to the surface acoustic wave resonant frequency of a magnetostrictive transducer. If feasible this would strongly enhance the viability of magnetically-transduced surface acoustic wave devices for remote detection of chemical/biological threats. Fabrication of such devices is compatible with conventional integrated circuit processing, so device arrays could be integrated with transistor electronics on a single chip to make a versatile, inexpensive system for remote chemical detection. The interaction between resonant precession (Ferromagnetic Resonance) and acoustic resonance will be characterized by measuring the ultrahigh-frequency (UHF) complex permeability of magnetic stripe structures with a fixed acoustic resonance frequency, varying the precession resonance with an external magnetic field. The structures, materials, and fields used will result in resonances in the range 1 MHz - 1 GHz. The coupling of resonant precession with a resonant surface acoustic wave has not been explored previously, and in addition to the sensor application, may lead to new insights into UHF properties of magnetic materials, particularly magnetic damping.%%% An important feature of the project is education and training, with emphasis on integration of research and education. The graduate student supported by this funding will establish a foundation for developing and characterizing novel magnetic devices for chemical/biological sensing applications. In addition, undergraduates will work in the PI's laboratory on projects related to this research effort and gain their first experience of performing research in a state-of-the-art environment. Additionally, the PI will participate in outreach activities via the NSF-funded Cornell Center for Material Research, as well as in other activities sponsored by the College of Engineering, such as the Cornell University Research In Engineering (CURIE) Academy, a program offering high-school girls the opportunity to explore careers in Engineering.This award is supported jointly by the NSF and the Intelligence Community. The Approaches to Combat Terrorism (ACT) Program in the Directorate for Mathematics and Physical Sciences supports new concepts in basic research and workforce development with the potential to contribute to national security.