2023
DOI: 10.3390/magnetochemistry9100214
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Equivalent Noise Analysis and Modeling for a Magnetic Tunnel Junction Magnetometer with In Situ Magnetic Feedback

Aiyu Dou,
Ru Bai,
Yucheng Sun
et al.

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 establish… Show more

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Cited by 2 publications
(2 citation statements)
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“…The resolution of the current sensors is directly related to the sensor noise. Our previous research indicates that compared to the open-loop configuration, the closed-loop sensors show slightly higher noise levels [21,22]. Therefore, in our subsequent study, we will systematically analyze the noise of dual-range closed-loop current sensors and optimize the feedback circuit design accordingly.…”
Section: Results and Analysismentioning
confidence: 99%
“…The resolution of the current sensors is directly related to the sensor noise. Our previous research indicates that compared to the open-loop configuration, the closed-loop sensors show slightly higher noise levels [21,22]. Therefore, in our subsequent study, we will systematically analyze the noise of dual-range closed-loop current sensors and optimize the feedback circuit design accordingly.…”
Section: Results and Analysismentioning
confidence: 99%
“…Firstly, at 3.1 mV/V/Oe, the device’s sensitivity is high. Furthermore, the apparatus demonstrates remarkable stability in relation to temperature [ 11 , 12 , 13 ]. Since the magnetic sensor is a Wheatstone bridge output type and does not have buffering and strong driving capabilities, an instrumentation amplifier is introduced at its back end specifically for weak driving sensing signals.…”
Section: Design Of High-precision Portable Digital Compass Systemmentioning
confidence: 99%