SGER: Field Programmable Magnetic Surface Acoustic Wave (SAW) Devices for Hybrid Sensor Networks

ECS-0632523P。俄勒冈州立大学达加特-这项研究旨在开发能够在复杂的传感器网络中进行无线询问的无源(无电池)磁性传感器。这种器件是基于表面声波(SAW)在压电衬底中的传播速度变化的，该速度是由于覆盖的磁性薄膜对外部磁场的响应而改变的。为了实现这一建议的目标，PI计划设计和制造基于压电衬底上的声电效应波(SAW)的传感器。这是在SAW衬底上集成磁阻(MR)膜的第一个例子，传感器信号表现为脉冲延迟而不是幅度变化，提供了更好的分辨能力。该活动将通过与天线和反射器的进一步集成来探索选择性可编程识别(ID)型设备特征。该项目将有助于建立无源和现场可编程声表面波器件的可能性，因为用于热写入的射频信号能量尚未被报道。广泛的影响：该项目为无源无线设备的潜在应用开辟了一个新的场所，包括电流传感、位置传感、结构健康监测以及环境监测(如果是生化功能的话)。此外，由于它们不需要电池，并且它们的数据可以通过无线查询来检索，因此这些传感器可以在偏远和不可访问的位置使用。拟议的研究将在1名研究生和1名本科生的协助下进行。PI积极参与本科生、高级项目以及带来多样性和教授新课程。

ECS-0632523P. Dhagat, Oregon State UniversityThe research aims to develop passive (battery-less) magnetic sensors amenable to wireless interrogation in complex sensor networks. The devices are based on the propagation velocity of surface acoustic waves (SAWs) in a piezoelectric substrate changing due to the resistance of an overlying magnetic film responding to external magnetic fields.Intellectual Merit To accomplish the goals of this proposal the PI plans to design and fabricate sensors based on acousto-electric effect waves (SAW) on a piezoelectric substrate. It is the first example of an integration of a magnetoresistive (MR) film on SAW substrates and the sensor signal manifest as a pulse delay instead of an amplitude change providing better discrimination. The activity will explore selectively programmable identification (ID) type device feature by further integration with antenna and reflectors. This project would help to establish the possibilities of passive and field programmable SAW devices since RF signal energy for thermal writing has not been reported yet. Broad Impact: This project opens a new venue for potential applications of passive, wireless devices including current sensing, position sensing, structural health monitoring and, if bio-chemically functionalized, environment monitoring. Further, as they require no battery and their data can be retrieved by a wireless query the sensors may be used in remote and inaccessible locations. The proposed research will be conducted with the assistance of 1 graduate and 1 undergraduate student. The PI is intensely involved in undergraduate students senior projects and by bringing diversity and teaching new courses.