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We developed a cryogen-free scanned superconducting quantum interference device (SQUID) microscope for advanced material analysis. This system enables high-bandwidth RF measurements and sensitive magnetic characterization at variable temperatures.

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Area of Science:

  • Physics
  • Materials Science
  • Quantum Technologies

Background:

  • Superconducting Quantum Interference Devices (SQUIDs) are crucial for sensitive magnetic field detection.
  • Existing SQUID microscopy systems often require complex cryogenic infrastructure.
  • Advancements in cryogen-free systems are essential for broader accessibility and application.

Purpose of the Study:

  • To present a novel scanned superconducting quantum interference device (SQUID) microscope.
  • To demonstrate its operation in a cryogen-free cryostat.
  • To highlight its capabilities for high-bandwidth radio frequency (RF) measurements and magnetic characterization.

Main Methods:

  • Utilized planar gradiometric DC SQUIDs with on-chip field coils for susceptometry.
  • Integrated up to forty RF connections with 20 GHz bandwidth to the device under test.
  • Employed a cryogenic chip socket and silicon interposer to minimize RF losses.
  • Implemented active and passive magnetic shielding for a low residual magnetic field.

Main Results:

  • Achieved a system noise of 1.3 μΦ0/Hz at a base temperature of 3.3 K.
  • Demonstrated simultaneous magnetometry and susceptibility measurements above 40 K.
  • Reported round-trip RF losses of approximately 15 dB at 20 GHz.
  • Attained a residual magnetic field below 100 nT at the sample location.

Conclusions:

  • The developed cryogen-free SQUID microscope offers versatile and sensitive magnetic measurement capabilities.
  • Its high RF bandwidth and variable temperature operation expand potential applications in materials science and quantum device characterization.
  • This system represents a significant step towards more accessible and advanced nanoscale magnetic imaging.