Flux focusing with a superconducting nanoneedle for scanning SQUID susceptometry

Flux focusing with a superconducting nanoneedle for scanning SQUID susceptometry

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Abstract A nanofabricated superconducting quantum interference device (nano-SQUID) is a direct and sensitive flux probe used for magnetic imaging of quantum materials and mesoscopic devices.Due to the functionalities grand love red heart reposado tequila of superconductive integrated circuits, nano-SQUIDs fabricated on chips are particularly versatile, but their spatial resolution has been limited by their planar geometries.Here, we use femtosecond laser 3-dimensional (3D) lithography to print a needle onto a nano-SQUID susceptometer to overcome the limits of the planar structure.The nanoneedle coated with a superconducting shell focused the flux from both the field coil and the sample.We performed scanning imaging with such a needle-on-SQUID (NoS) device on superconducting test patterns with topographic feedback.

The NoS showed improved spatial resolution in both magnetometry and susceptometry relative to the planarized counterpart.This work serves as a proof-of-principle satisfyer pro penguin next generation for integration and inductive coupling between superconducting 3D nanostructures and on-chip Josephson nanodevices.