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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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A flexible nitrogen-vacancy center probe for scanning magnetometry.

Maosen Guo1, Mengqi Wang1, Pengfei Wang1

  • 1CAS Key Laboratory of Microscale Magnetic Resonance and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China; Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China; and Synergetic Innovation Centre of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China.

The Review of Scientific Instruments
|July 10, 2021
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Summary

We developed a novel diamond probe for scanning magnetometry using nitrogen-vacancy centers. This new probe enables high-resolution imaging of magnetic structures like skyrmions and offers improved reusability for commercial applications.

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Area of Science:

  • Physics
  • Materials Science
  • Nanotechnology

Background:

  • Scanning magnetometry relies heavily on diamond probes utilizing nitrogen-vacancy centers.
  • Existing fabrication methods for diamond probes are complex and time-consuming.

Purpose of the Study:

  • To design and fabricate a novel, simplified diamond probe for scanning magnetometry.
  • To demonstrate the probe's capability for high-resolution magnetic imaging.

Main Methods:

  • Fabrication of a diamond chip with an array of pillars using ultraviolet laser cutting.
  • Characterization of the probe's yield, convertibility, and reusability.
  • Demonstration of magnetic skyrmion imaging with nanoscale resolution.

Main Results:

  • A new type of diamond probe with an array of pillars was successfully fabricated on a (100 µm)² × 50 µm diamond chip.
  • The fabrication process was simplified, avoiding lithography and reactive ion etching.
  • The probe demonstrated high yield, single-pillar convertibility, and reusability.
  • Successful nanoscale imaging of a single magnetic skyrmion was achieved.

Conclusions:

  • The developed diamond probe offers a simplified, efficient, and reusable solution for scanning magnetometry.
  • This technology holds significant potential for commercial applications in nanoscale magnetic imaging.