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Scanning gradiometry with a single spin quantum magnetometer.

W S Huxter1, M L Palm1, M L Davis1

  • 1Department of Physics, ETH Zurich, Otto Stern Weg 1, 8093, Zurich, Switzerland.

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|June 29, 2022
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Summary
This summary is machine-generated.

This study introduces a new quantum sensing technique using diamond probes to image weak magnetic fields with unprecedented sensitivity. The method enhances magnetic imaging of nanoscale materials and devices.

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Area of Science:

  • Quantum Sensing
  • Nanoscale Magnetism
  • Materials Science

Background:

  • Diamond-based quantum sensors, utilizing spin defects like nitrogen-vacancy (NV) centers, enable nanoscale magnetic imaging.
  • Current methods primarily measure static magnetic stray fields, limiting sensitivity for weakly magnetic systems.

Purpose of the Study:

  • To develop and demonstrate a gradiometry technique for significantly enhancing the sensitivity of quantum sensing for static magnetic fields.
  • To enable new opportunities in imaging weakly magnetic systems with higher resolution and accuracy.

Main Methods:

  • Utilizing a single nitrogen-vacancy (NV) center at the tip of a scanning diamond probe.
  • Employing mechanical oscillation of the NV center to up-convert spatial gradients into AC magnetic fields.
  • Applying sensitive AC quantum sensing protocols for gradient measurement.

Main Results:

  • Achieved an order-of-magnitude improvement in sensitivity compared to static field imaging.
  • Demonstrated more localized and sharper imaging capabilities.
  • Showcased strong suppression of magnetic field drifts, improving stability.
  • Successfully imaged nanotesla fields from antiferromagnetic defects, graphene currents, and paramagnetic/diamagnetic metals.

Conclusions:

  • The developed gradiometry technique substantially enhances quantum sensing capabilities for static magnetic fields.
  • This advancement opens new avenues for high-sensitivity nanoscale magnetic imaging of diverse materials.
  • The method offers superior sensitivity, resolution, and stability for probing magnetic phenomena.