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Magnetic field sensors using VO2/Fe3O4nanoparticle devices.

Massood Tabib-Azar1

  • 1Electrical and Computer Eng. Department, University of Utah, Salt Lake City, UT 84112, United States of America.

Nanotechnology
|July 28, 2023
PubMed
Summary

This study developed a novel magnetometer by combining vanadium dioxide (VO2) and iron oxide (Fe3O4) nanoparticles. The resulting device exhibits high sensitivity and switching characteristics for magnetic field detection.

Keywords:
biomimeticmagnetometermetal-insulator transition (MIT)neuromorphic

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Vanadium dioxide (VO2) exhibits a metal-insulator transition (MIT) with significant changes in electrical resistance.
  • Iron oxide (Fe3O4) possesses unique magnetic properties, including magnetoresistance and magnetostriction.
  • Integrating materials with distinct physical properties can lead to novel sensor functionalities.

Purpose of the Study:

  • To engineer a highly sensitive magnetometer by synergistically combining the MIT properties of VO2 and the magnetic properties of Fe3O4.
  • To investigate the current-voltage characteristics and magnetic field response of the composite material.
  • To achieve large nonlinearity and switching behavior in a magnetic field sensor.

Main Methods:

  • Fabrication of a two-terminal device by drop-casting a mixture of VO2, Fe3O4 nanoparticles, and a silver paint binder.
  • Characterization of the device's current-voltage (I-V) behavior under varying external magnetic fields.
  • Analysis of magnetoresistance and magnetostriction effects in the Fe3O4 component to understand field sensitivity.

Main Results:

  • The fabricated device demonstrated current-switching behavior linked to the VO2 MIT, modulated by the external magnetic field.
  • Both magnetoresistance and magnetostriction of Fe3O4 contributed to the sensor's sensitivity.
  • High sensitivities of 1 A nT⁻¹ (or 50.8 V T⁻¹ with current bias) were achieved near the MIT voltage.
  • A minimum detectable signal of 20 pT/√Hz was obtained.

Conclusions:

  • The combination of VO2 and Fe3O4 nanoparticles successfully created a magnetometer with significant nonlinearity and switching characteristics.
  • The developed sensor leverages the distinct physical phenomena of both materials for enhanced magnetic field detection.
  • The device shows promise for applications requiring sensitive and switchable magnetic field sensing.