Equivalent Noise Analysis and Modeling for a Magnetic Tunnel Junction Magnetometer with In Situ Magnetic Feedback

IF 2.6 4区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Magnetochemistry Pub Date : 2023-09-29 DOI:10.3390/magnetochemistry9100214

Aiyu Dou, Ru Bai, Yucheng Sun, Jiakun Tu, Chuanjia Kou, Xin Xie, Zhenghong Qian

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Abstract

Magnetic tunnel junction (MTJ) sensors have been one of the excellent candidates for magnetic field detection due to their high sensitivity and compact size. In this paper, we design a magnetometer with in situ magnetic feedback consisting of an MTJ sensor. To analyze and evaluate the detectivity of the MTJ magnetometer, a noise model of the MTJ sensor in the magnetometer without magnetic feedback is first developed. Then, the noise model of the MTJ magnetometer with in situ magnetic feedback is also established, including the noises of the MTJ sensor and the signal conditioning circuit, as well as the feedback circuit. The equivalent noise model of the MTJ magnetometer with in situ magnetic feedback is evaluated through nonlinear fitting for the noise voltage spectrum. Although the noise generated by the MTJ sensor is much greater than that of the signal conditioning circuit, the noise introduced by the feedback coils into the MTJ sensor is slightly more than twice that generated by the MTJ sensor itself. The measurement results show that the detectivity of the MTJ magnetometer with in situ magnetic feedback reaches 526 pT/Hz1/2 at 10 Hz. The equivalent noise analysis method presented in this paper is suitable for the detectivity analysis of magnetometers with magnetic feedback.

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具有原位磁反馈的磁隧道结磁强计等效噪声分析与建模

磁隧道结(MTJ)传感器由于其高灵敏度和紧凑的尺寸而成为磁场检测的理想选择之一。本文设计了一种由MTJ传感器组成的原位磁反馈磁强计。为了分析和评价MTJ磁强计的探测性，首先建立了无磁反馈的MTJ传感器的噪声模型。然后，建立了具有原位磁反馈的MTJ磁强计的噪声模型，包括MTJ传感器和信号调理电路的噪声以及反馈电路的噪声。通过对噪声电压谱的非线性拟合，建立了具有原位磁反馈的MTJ磁强计的等效噪声模型。虽然MTJ传感器产生的噪声远大于信号调理电路，但反馈线圈引入MTJ传感器的噪声略大于MTJ传感器本身产生的噪声的两倍。测量结果表明，具有原位磁反馈的MTJ磁强计在10 Hz时的探测率达到526 pT/Hz1/2。本文提出的等效噪声分析方法适用于磁反馈磁强计的探测性分析。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Magnetochemistry Chemistry-Chemistry (miscellaneous)

CiteScore

3.90

自引率

11.10%

发文量

145

审稿时长

11 weeks

期刊介绍： Magnetochemistry (ISSN 2312-7481) is a unique international, scientific open access journal on molecular magnetism, the relationship between chemical structure and magnetism and magnetic materials. Magnetochemistry publishes research articles, short communications and reviews. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.