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Micromachines
Volume 13
Issue 11
10.3390/mi13111898
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Article

High Sensitivity Planar Hall Effect Magnetic Field Gradiometer for Measurements in Millimeter Scale Environments

by
Hariharan Nhalil
1,
Moty Schultz
1,
Shai Amrusi
2,
Asaf Grosz
2 and
Lior Klein
1,*
1
Department of Physics, Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan 52900, Israel
2
Department of Electrical and Computer Engineering, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84105, Israel
*
Author to whom correspondence should be addressed.
Micromachines 2022, 13(11), 1898; https://doi.org/10.3390/mi13111898
Submission received: 15 September 2022 / Revised: 20 October 2022 / Accepted: 27 October 2022 / Published: 2 November 2022
(This article belongs to the Special Issue Magnetic and Spin Devices, Volume II)
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Abstract

We report a specially designed magnetic field gradiometer based on a single elliptical planar Hall effect (PHE) sensor, which allows measuring magnetic field at nine different positions in a 4 mm length scale. The gradiometer detects magnetic field gradients with equivalent gradient magnetic noises of ∼958, ∼192, ∼51, and ∼26 nT/m√ Hz (pT/mm√Hz) at 0.1, 1, 10, and 50 Hz, respectively. The performance of the gradiometer is tested in ambient conditions by measuring the field gradient induced by electric currents driven in a long straight wire. This gradiometer is expected to be highly useful for the measurement of magnetic field gradients in confined areas for its small footprint, low noise, scalability, simple design, and low costs.
Keywords: planar hall effect; gradiometer; magnetic sensor planar hall effect; gradiometer; magnetic sensor

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MDPI and ACS Style

Nhalil, H.; Schultz, M.; Amrusi, S.; Grosz, A.; Klein, L. High Sensitivity Planar Hall Effect Magnetic Field Gradiometer for Measurements in Millimeter Scale Environments. Micromachines 2022, 13, 1898. https://doi.org/10.3390/mi13111898

AMA Style

Nhalil H, Schultz M, Amrusi S, Grosz A, Klein L. High Sensitivity Planar Hall Effect Magnetic Field Gradiometer for Measurements in Millimeter Scale Environments. Micromachines. 2022; 13(11):1898. https://doi.org/10.3390/mi13111898

Chicago/Turabian Style

Nhalil, Hariharan, Moty Schultz, Shai Amrusi, Asaf Grosz, and Lior Klein. 2022. "High Sensitivity Planar Hall Effect Magnetic Field Gradiometer for Measurements in Millimeter Scale Environments" Micromachines 13, no. 11: 1898. https://doi.org/10.3390/mi13111898

APA Style

Nhalil, H., Schultz, M., Amrusi, S., Grosz, A., & Klein, L. (2022). High Sensitivity Planar Hall Effect Magnetic Field Gradiometer for Measurements in Millimeter Scale Environments. Micromachines, 13(11), 1898. https://doi.org/10.3390/mi13111898

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