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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
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Tunable magnetic field source for magnetic field imaging microscopy.

Andris Berzins1, Hugo Grube1, Reinis Lazda1

  • 1Laser Centre, University of Latvia, Jelgavas Street 3, LV-1004 Riga, Latvia.

Ultramicroscopy
|October 10, 2022
PubMed
Summary

We developed a new, compact magnetic field source for microscopy, offering tunable fields from 1-222 mT with high homogeneity. This device enables precise magnetic field imaging on a micrometer scale.

Keywords:
Magnetic field imaging microscopyNitrogen–Vacancy centersOptically detected magnetic resonanceTunable magnetic field source

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Area of Science:

  • Physics
  • Materials Science
  • Microscopy

Background:

  • Magnetic field imaging microscopy requires precise and controllable magnetic field sources.
  • Existing sources may lack compactness, power efficiency, or field tunability.

Purpose of the Study:

  • To design and demonstrate a novel, compact, and power-efficient variable magnetic field source for magnetic field imaging microscopy.
  • To achieve high magnetic field homogeneity on a micrometer scale.

Main Methods:

  • Utilized a design based on diametrically magnetized permanent magnet cylinders with electro-mechanical rotation control.
  • Incorporated ferrite flux homogenizers to improve field uniformity.
  • Employed Hall probes and nitrogen-vacancy (NV) centers in diamond for proof-of-concept and characterization.
  • Validated experimental results with numerical simulations.

Main Results:

  • Demonstrated a tunable magnetic field source with amplitude ranging from 1 mT to 222 mT.
  • Achieved high magnetic field homogeneity of 2 ppm/μm (0.5 μT/μm) at 222 mT.
  • Verified magnetic field distribution through comparison of simulation and experimental data.
  • Characterized field homogeneity on a micrometer scale within a 25 × 25 μm field of view.

Conclusions:

  • The novel magnetic field source design is effective for magnetic field imaging microscopy.
  • The device offers a tunable, homogeneous magnetic field suitable for nanoscale applications.
  • The compact and power-efficient design advances capabilities in high-resolution magnetic field characterization.