论文标题
用超导纳米针线聚焦用于扫描乌贼
Flux focusing with a superconducting nano-needle for scanning SQUID susceptometry
论文作者
论文摘要
纳米制作的超导量子干扰装置（纳米平方）是一种直接且敏感的通量探针，可用于量子材料和介观设备的磁成像。由超导综合电路的功能启用，在芯片上制造的纳米嵌段尤其广泛，但空间分辨率受其平面几何形状的限制。在这里，我们使用飞秒激光射击3维（3D）光刻，并将针打到纳米侧的启示仪上以克服平面结构的极限。用超导壳涂有涂层的纳米针线均聚焦于田间线圈和样品中的通量。我们使用这种针线开机（NOS）设备在具有地形反馈的超导测试模式上执行扫描成像。 NOS在其平面化对应物上均显示出磁力测定法和弹性矩测定法的空间分辨率。这项工作是超导3D纳米结构和片上约瑟夫森纳米devices之间集成和电感耦合的原则证明。
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.
