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Related Experiment Video

Updated: Aug 22, 2025

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
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High Sensitivity Planar Hall Effect Magnetic Field Gradiometer for Measurements in Millimeter Scale Environments.

Hariharan Nhalil1, Moty Schultz1, Shai Amrusi2

  • 1Department of Physics, Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan 52900, Israel.

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|November 11, 2022
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Summary

A novel magnetic field gradiometer uses a single planar Hall effect (PHE) sensor to measure magnetic fields across nine positions. This compact, low-noise device offers high performance for gradient measurements in confined spaces.

Keywords:
gradiometermagnetic sensorplanar hall effect

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Area of Science:

  • Physics
  • Materials Science
  • Electrical Engineering

Background:

  • Magnetic field measurements are crucial in various scientific and industrial applications.
  • Existing gradiometers can be bulky, expensive, or lack sensitivity in confined areas.
  • The planar Hall effect (PHE) offers a sensitive method for magnetic field detection.

Purpose of the Study:

  • To develop and characterize a compact magnetic field gradiometer using a single elliptical PHE sensor.
  • To assess the performance of the gradiometer in measuring magnetic field gradients.
  • To evaluate its suitability for applications in confined spaces.

Main Methods:

  • Design and fabrication of a specialized magnetic field gradiometer utilizing a single elliptical planar Hall effect sensor.
  • Measurement of magnetic field gradients at nine distinct positions within a 4 mm scale.
  • Characterization of equivalent gradient magnetic noise at various frequencies (0.1, 1, 10, and 50 Hz).
  • Experimental validation by measuring the field gradient from electric currents in a straight wire under ambient conditions.

Main Results:

  • The gradiometer successfully measures magnetic fields at nine positions over a 4 mm length.
  • Achieved equivalent gradient magnetic noises of approximately 958, 192, 51, and 26 nT/m√Hz at 0.1, 1, 10, and 50 Hz, respectively.
  • Demonstrated performance in ambient conditions, accurately detecting field gradients from electric currents.

Conclusions:

  • The developed PHE sensor-based gradiometer provides a sensitive and accurate method for magnetic field gradient measurement.
  • Its small footprint, low noise, scalability, and cost-effectiveness make it ideal for applications in confined environments.
  • This technology holds significant potential for advancing magnetic field sensing in restricted spaces.