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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
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A scalable high-performance magnetic shield for very long baseline atom interferometry.

E Wodey1, D Tell1, E M Rasel1

  • 1Leibniz Universität Hannover, Institut für Quantenoptik, Welfengarten 1, 30167 Hannover, Germany.

The Review of Scientific Instruments
|April 9, 2020
PubMed
Summary

We developed a 10-meter magnetic shield for atom interferometry, achieving low residual fields. This enables precise measurements for fundamental physics tests, like the universality of free fall.

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Area of Science:

  • Atomic physics
  • Quantum sensing
  • Metrology

Background:

  • Precise measurements in atom interferometry are crucial for fundamental physics.
  • Magnetic field gradients can introduce significant systematic errors.
  • Existing magnetic shielding solutions may not be suitable for long baselines.

Purpose of the Study:

  • To design and construct a high-performance magnetic shield for long-baseline atom interferometry.
  • To characterize the shielding performance and assess its suitability for precision measurements.
  • To enable new experiments testing fundamental physics, such as the universality of free fall.

Main Methods:

  • Design and construction of a modular 10 m-long magnetic shield.
  • Characterization of residual magnetic fields and longitudinal inhomogeneities.
  • Integration of the shield into a very long baseline atom interferometer setup.

Main Results:

  • Achieved residual magnetic fields below 4 nT.
  • Measured longitudinal magnetic field inhomogeneities below 2.5 nT/m over 8 m.
  • Demonstrated that the modular design maintains shielding performance for extended baselines.

Conclusions:

  • The developed magnetic shield meets the stringent requirements for long-baseline atom interferometry.
  • The setup significantly reduces magnetic field gradient biases to the sub-pm/s² level.
  • This technology advances the potential for high-precision tests of the universality of free fall.