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Related Concept Videos

Atomic Force Microscopy01:08

Atomic Force Microscopy

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Related Experiment Video

Updated: Mar 21, 2026

Scanning SQUID Study of Vortex Manipulation by Local Contact
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Quantitative nanoscale vortex imaging using a cryogenic quantum magnetometer.

L Thiel1, D Rohner1, M Ganzhorn1

  • 1Department of Physics, University of Basel, Klingelbergstrasse 82, Basel CH-4056, Switzerland.

Nature Nanotechnology
|May 3, 2016
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel cryogenic quantum sensor using a nitrogen-vacancy (NV) center in diamond for nanoscale magnetic imaging of superconductors. This sensor overcomes limitations in existing tools, enabling precise measurements of vortex behavior in materials like YBa2Cu3O7-δ.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Sensing
  • Materials Science

Background:

  • Microscopic studies of superconductors and their vortices are crucial for understanding superconductivity mechanisms.
  • Existing experimental tools lack quantitative nanoscale magnetometry over wide temperature and magnetic field ranges.
  • Local measurements of penetration depths and magnetic stray fields provide insights into superfluid densities and order parameter symmetry.

Purpose of the Study:

  • To demonstrate a novel cryogenic scanning quantum sensor for nanoscale magnetic imaging of superconductors.
  • To overcome limitations of existing experimental tools for quantitative magnetometry.
  • To investigate Pearl vortices in cuprate superconductors with nanoscale precision.

Main Methods:

  • Utilized a single nitrogen-vacancy (NV) electronic spin in diamond as a cryogenic scanning quantum sensor.
  • Performed quantitative, nanoscale magnetic imaging of Pearl vortices in YBa2Cu3O7-δ.
  • Employed a sensor-to-sample distance of approximately 10 nm.

Main Results:

  • Observed striking deviations from the monopole approximation in vortex stray-field images.
  • Achieved excellent quantitative agreement with Pearl's analytic model.
  • Provided non-invasive and unambiguous determination of the local penetration depth.

Conclusions:

  • The developed cryogenic quantum sensor overcomes existing limitations in nanoscale magnetometry.
  • The sensor enables precise measurements of superconducting vortices and material properties.
  • This technology opens new avenues for exploring strongly correlated electron physics and benchmarking microscopic models.