Nano-superconducting quantum interference devices with suspended junctions
Nano-superconducting quantum interference devices with suspended junctions
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DOI：
10.1063/1.4871317
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发表时间：
2014-04-14
影响因子：
4
通讯作者：
Hasselbach, K.
中科院分区：
文献类型：
--
作者：
Hazra, D.;Kirtley, J. R.;Hasselbach, K.
纳米超导量子干涉器件（纳米 SQUID）通常由单层铌或铝制成。我们在这里描述了一种在 Nb/Al 薄膜双层中制造悬浮纳米桥的简单方法。我们使用这些充当约瑟夫森薄弱环节的悬桥来制造纳米 SQUID，该纳米 SQUID 在高达 1.5K 的温度和高达 20mT 的磁通量密度下表现出临界电流振荡。这些纳米 SQUID 的通量调制深度介于全铝和全铌器件之间，具有两者的一些理想特性。悬浮的几何形状对于磁性单纳米粒子测量很有吸引力。 (C) 2014 AIP 出版有限责任公司。
Nano-Superconducting Quantum Interference Devices (nano-SQUIDs) are usually fabricated from a single layer of either Nb or Al. We describe here a simple method for fabricating suspended nano-bridges in Nb/Al thin-film bilayers. We use these suspended bridges, which act as Josephson weak links, to fabricate nano-SQUIDs which show critical current oscillations at temperatures up to 1.5K and magnetic flux densities up to over 20mT. These nano-SQUIDs exhibit flux modulation depths intermediate between all-Al and all-Nb devices, with some of the desirable characteristics of both. The suspended geometry is attractive for magnetic single nanoparticle measurements. (C) 2014 AIP Publishing LLC.