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Picotesla-sensitivity microcavity optomechanical magnetometry.

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Summary
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This study introduces a new microcavity optomechanical magnetometer (MCOM) using FeGaB thin films, achieving unprecedented sensitivity for magnetic field sensing. The developed device offers over two orders of magnitude improvement, enabling precise measurements without a bias magnetic field.

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Area of Science:

  • Physics
  • Materials Science
  • Engineering

Background:

  • Cavity optomechanical systems enhance magnetic field sensing through optical and mechanical resonance.
  • Previous microcavity optomechanical magnetometry (MCOM) using Terfenol-D films had limited sensitivity (585 pT Hz-1/2).

Purpose of the Study:

  • To develop a high-sensitivity, mass-producible MCOM by employing FeGaB thin films on SiO2 WGM microdisks.
  • To theoretically explore magnetic actuation and noise-limited sensitivity by varying film and microdisk parameters.
  • To demonstrate real-time pulsed magnetic field measurement for applications like corona current monitoring.

Main Methods:

  • Sputtering FeGaB thin films onto high-Q SiO2 whispering gallery mode (WGM) microdisks.
  • Fabricating and characterizing multiple magnetometers with varying radii and film thicknesses.
  • Conducting theoretical studies on magnetic actuation constant and noise-limited sensitivity.

Main Results:

  • Achieved a peak sensitivity of 1.68 pT Hz-1/2 at 9.52 MHz using a 355 μm radius microdisk and 1.3 μm thick FeGaB film.
  • Demonstrated over two orders of magnitude sensitivity improvement compared to previous Terfenol-D sputtered films.
  • Operated without a bias magnetic field due to FeGaB's soft magnetic properties.

Conclusions:

  • The FeGaB-based MCOM offers a significant advancement in magnetic field sensing sensitivity and performance.
  • The developed magnetometer is suitable for real-time pulsed magnetic field measurements, such as corona current in high-voltage lines.
  • High-sensitivity magnetometers show potential for applications in magnetic induction tomography and corona current monitoring.