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Related Experiment Video

Updated: Feb 23, 2026

Scanning SQUID Study of Vortex Manipulation by Local Contact

Scanning SQUID Study of Vortex Manipulation by Local Contact

Published on: February 1, 2017

Scanning SQUID sampler with 40-ps time resolution.

Zheng Cui¹, John R Kirtley², Yihua Wang³

¹Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.

The Review of Scientific Instruments

|September 3, 2017

Summary

This summary is machine-generated.

This study introduces a novel scanning Superconducting QUantum Interference Device (SQUID) sampler. It achieves 40-picosecond time resolution for imaging magnetic material dynamics.

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Area of Science:

Condensed Matter Physics
Materials Science
Nanotechnology

Background:

Scanning SQUID microscopy is crucial for characterizing magnetic properties of materials and devices.
Traditional flux-locked loops in SQUIDs limit response times to microseconds or longer, hindering dynamic studies.

Purpose of the Study:

To design, fabricate, and characterize a novel scanning SQUID sampler.
To achieve significantly improved time resolution (40 ps) for dynamic magnetic imaging.
To enable linearized response for periodically triggered signals.

Main Methods:

Development of a SQUID sampler with a micron-scale pickup loop and integrated field and modulation coils.
Fabrication of the sampler device on a 2 mm × 2 mm chip for scanning macroscopic planar samples.
Operation in a flux-locked loop to linearize the flux response.

Main Results:

Demonstration of a scanning SQUID sampler with 40-picosecond time resolution.
Achieved flux noise of approximately 1 mΦ₀ at 4.2 K with 100 kHz repetition rate and 1s averaging.
Successful integration of features for local magnetic field application and linearized flux response.

Conclusions:

The developed SQUID sampler offers unprecedented temporal resolution for magnetic imaging.
This technology is poised to advance the study of dynamic processes in magnetic and superconducting materials.
The compact, scannable design facilitates versatile applications in materials characterization.