A High-Performance Nb Nano-Superconducting Quantum Interference Device with a Three-Dimensional Structure.
A High-Performance Nb Nano-Superconducting Quantum Interference Device with a Three-Dimensional Structure.
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DOI：
10.1021/acs.nanolett.6b03826
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发表时间：
2016-11
期刊：
影响因子：
10.8
通讯作者：
Lei Chen;Hao Wang;Xiaoyu Liu;Long Wu;Zhen Wang
中科院分区：
文献类型：
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作者：
Lei Chen;Hao Wang;Xiaoyu Liu;Long Wu;Zhen Wang
一种微型化到纳米尺度的超导量子干涉装置（SQUID）在感应探测单个电子自旋方面具有前景。在单次自旋共振测量中，迫切需要具有强自旋耦合系数、低磁通噪声和宽工作磁场范围的纳米squid。具有Dayem桥结的纳米鱿鱼在高工作范围和自旋与桥的直接耦合方面表现优异。然而，常见的平面结构的纳米鱿鱼是众所周知的问题，如浅磁通调制深度和一个麻烦的电流-电压曲线的滞后。在这里，我们开发了一种制造工艺，用于制造三维（3-D）铌（Nb）纳米鱿鱼，其纳米桥结可以独立调谐。该器件的特性显示出高达45.9%的调制深度和可逆的电流-电压曲线。由于调制深度大，测量到的磁通噪声低至0.34 μΦ0/Hz1/2。平行于SQUID平面的工作范围大于0.5 T。我们相信三维Nb纳米鱿鱼为有效的单自旋感应检测提供了有希望的一步。
A superconducting quantum interference device (SQUID) miniaturized into the nanoscale is promising in the inductive detection of a single electron spin. A nano-SQUID with a strong spin coupling coefficient, a low flux noise, and a wide working magnetic field range is highly desired in a single spin resonance measurement. Nano-SQUIDs with Dayem bridge junctions excel in a high working field range and in the direct coupling from spins to the bridge. However, the common planar structure of nano-SQUIDs is known for problems such as a shallow flux modulation depth and a troublesome hysteresis in current-voltage curves. Here, we developed a fabrication process for creating three-dimensional (3-D) niobium (Nb) nano-SQUIDs with nanobridge junctions that can be tuned independently. Characterization of the device shows up to 45.9% modulation depth with a reversible current-voltage curve. Owning to the large modulation depth, the measured flux noise is as low as 0.34 μΦ0/Hz1/2. The working field range of the SQUID is greater than 0.5 T parallel to the SQUID plane. We believe that 3-D Nb nano-SQUIDs provide a promising step toward effective single-spin inductive detection.