Flux focusing with a superconducting nano-needle for scanning SQUID susceptometry
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2022
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| _version_ | 1866909618863603712 |
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| author | Xiang, B. K. Wang, S. Y. Wang, Y. F. Zhu, J. J. Xu, H. T. Wang, Y. H. |
| author_facet | Xiang, B. K. Wang, S. Y. Wang, Y. F. Zhu, J. J. Xu, H. T. Wang, Y. H. |
| contents | Nano-fabricated superconducting quantum interference device (nano-SQUID) is a direct and sensitive flux probe useful for magnetic imaging of quantum materials and mesoscopic devices. Enabled by functionalities of superconductive integrated circuits, nano-SQUID fabricated on a chip is particularly versatile but spatial resolution has been limited by its planar geometry. Here, we use femtosecond-laser 3-dimensional (3D) lithography and print a needle onto a nano-SQUID susceptometer to overcome the limit of a plane-structure. The nano-needle coated with a superconducting shell focuses the flux both from the field coil and the sample. We perform scanning imaging using such a needle-on-SQUID (NoS) device on superconducting test patterns with topographic feedback. The NoS shows improved spatial resolution in both magnetometry and susceptometry over its planarized counterpart. This work serves as a proof-of-principle for the integration and inductive coupling between superconducting 3D nano-structures and on-chip Josephson nano-devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2209_10748 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Flux focusing with a superconducting nano-needle for scanning SQUID susceptometry Xiang, B. K. Wang, S. Y. Wang, Y. F. Zhu, J. J. Xu, H. T. Wang, Y. H. Instrumentation and Detectors Mesoscale and Nanoscale Physics Nano-fabricated superconducting quantum interference device (nano-SQUID) is a direct and sensitive flux probe useful for magnetic imaging of quantum materials and mesoscopic devices. Enabled by functionalities of superconductive integrated circuits, nano-SQUID fabricated on a chip is particularly versatile but spatial resolution has been limited by its planar geometry. Here, we use femtosecond-laser 3-dimensional (3D) lithography and print a needle onto a nano-SQUID susceptometer to overcome the limit of a plane-structure. The nano-needle coated with a superconducting shell focuses the flux both from the field coil and the sample. We perform scanning imaging using such a needle-on-SQUID (NoS) device on superconducting test patterns with topographic feedback. The NoS shows improved spatial resolution in both magnetometry and susceptometry over its planarized counterpart. This work serves as a proof-of-principle for the integration and inductive coupling between superconducting 3D nano-structures and on-chip Josephson nano-devices. |
| title | Flux focusing with a superconducting nano-needle for scanning SQUID susceptometry |
| topic | Instrumentation and Detectors Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2209.10748 |