Scanned SQUID microscope with high-speed electrical connectivity
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View abstract on PubMed
Summary
This summary is machine-generated.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.
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.
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