Study of Low-Frequency Noise Performance of Nanobridge-Based SQUIDs in External Magnetic Fields
Study of Low-Frequency Noise Performance of Nanobridge-Based SQUIDs in External Magnetic Fields
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基于纳米桥的 SQUID 在外部磁场中的低频噪声性能研究
DOI:
10.1109/tasc.2012.2233537
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发表时间:
2013
影响因子:
1.8
通讯作者:
Rozhko S
中科院分区:
文献类型:
--
作者:
Rozhko S
We report on the low-frequency noise performance of niobium dc superconducting quantum interference devices (SQUIDs), which contain nanobridges fabricated by focused ion beam lithography as the active Josephson elements. The devices have feature sizes down to 70 nm. We have measured devices of different loop sizes in two readout configurations: nano-scale loop sizes in small signal mode using a series SQUID array as a low-temperature pre-amplifier, and larger micron-scale loop sizes in a conventional flux-locked loop. We investigate the different contributions to the low frequency noise and report on electrical measurements made in applied magnetic fields of up to 0.5 T (in-plane) and 0.1 T (perpendicular to the plane) at operating temperatures around 7 K. We compare the measurements with the existing theories of noise in a dc SQUID.
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