Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China.
Beijing Key Laboratory for Magnetoeletric Materials and Devices, Beijing, 100871, China.
Sci Rep. 2017 Aug 17;7(1):8592. doi: 10.1038/s41598-017-09420-w.
The magnetic flux gate sensors based on Faraday's Law of Induction are widely used for DC or extremely low frequency magnetic field detection. Recently, as the fast development of multiferroics and magnetoelectric (ME) composite materials, a new technology based on ME coupling effect is emerging for potential devices application. Here, we report a magnetoelectric flux gate sensor (MEFGS) for weak DC magnetic field detection for the first time, which works on a similar magnetic flux gate principle, but based on ME coupling effect. The proposed MEFGS has a shuttle-shaped configuration made of amorphous FeBSi alloy (Metglas) serving as both magnetic and magnetostrictive cores for producing a closed-loop high-frequency magnetic flux and also a longitudinal vibration, and one pair of embedded piezoelectric PMN-PT fibers ([011]-oriented Pb(Mg,Nb)O-PbTiO single crystal) serving as ME flux gate in a differential mode for detecting magnetic anomaly. In this way, the relative change in output signal of the MEFGS under an applied DC magnetic anomaly of 1 nT was greatly enhanced by a factor of 4 to 5 in comparison with the previous reports. The proposed ME flux gate shows a great potential for magnetic anomaly detections, such as magnetic navigation, magnetic based medical diagnosis, etc.
基于法拉第电磁感应定律的磁通门传感器广泛应用于直流或极低频磁场检测。最近，随着多铁性材料和磁电（ME）复合材料的快速发展，一种基于 ME 耦合效应的新技术正在为潜在的器件应用崭露头角。在这里，我们首次报道了一种基于 ME 耦合效应的弱直流磁场检测用磁电磁通门传感器（MEFGS）。该传感器基于类似的磁通门原理，但基于 ME 耦合效应。所提出的 MEFGS 采用非晶态 FeBSi 合金（Metglas）制成的梭形结构，用作产生闭环高频磁通和纵向振动的磁和磁致伸缩核心，以及一对嵌入式压电 PMN-PT 纤维（[011]取向 Pb(Mg,Nb)O-PbTiO 单晶）以差分模式作为 ME 磁通门，用于检测磁场异常。这样，与以前的报告相比，在施加 1 nT 的直流磁场异常时，MEFGS 的输出信号的相对变化大大增强了 4 到 5 倍。所提出的 ME 磁通门在磁场异常检测方面具有很大的潜力，例如磁导航、基于磁场的医疗诊断等。
