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首页> 外文期刊>Magnetics, IEEE Transactions on >Fluxgate Principle Applied to a Magnetic Tunnel Junction for Weak Magnetic Field Sensing
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Fluxgate Principle Applied to a Magnetic Tunnel Junction for Weak Magnetic Field Sensing

机译：磁通门原理在弱磁场感应的磁性隧道结中的应用

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摘要

A method is presented for measuring weak magnetic fields by applying a measurement principle known from fluxgate magnetometers to a magnetic tunnel junction. The fluxgate measurement principle based on second harmonic detection is transferred to magnetic tunnel junctions embedded in current lines. Based on Fourier analysis, we developed an analytical model to describe the response of a magnetic tunnel junction fluxgate sensor. The analytical result is compared to MATLAB simulations using Fast Fourier Transformation. Experimental results are obtained with a sensor prototype using lock-in amplification to detect the second harmonic component of the signal generated by the resistance change of the junction. A linear sensor characteristic with a sensitivity in the order of mV/mT is detected in an unshielded setup. Design improvements of the sensor layout as well as a low RA product of the magnetic tunnel junctions should make it possible in the future to detect pT-fields. A cheap sensing technology using magnetic tunnel junctions with the ability of measuring fields in the order of pT could promote novel diagnostic methods such as magnetocardiography into daily clinical routine.
机译：提出了一种通过将磁通门磁力计已知的测量原理应用于磁性隧道结来测量弱磁场的方法。基于二次谐波检测的磁通门测量原理被传输到电流线中嵌入的磁性隧道结。基于傅立叶分析，我们开发了一个分析模型来描述磁隧道结磁通门传感器的响应。将分析结果与使用快速傅里叶变换的MATLAB仿真进行比较。通过使用锁定放大的传感器原型获得的实验结果可检测由结的电阻变化产生的信号的二次谐波分量。在非屏蔽设置中会检测到灵敏度为mV / mT的线性传感器特性。传感器布局的设计改进以及磁隧道结的低RA乘积将使将来有可能检测pT场。一种廉价的传感技术，使用能够以pT量级测量磁场的磁性隧道结，可以将新颖的诊断方法（如心电图）推广到日常临床工作中。

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