Small area, low-inductance niobium SQUID for the detection of single atomic spin-flips

We report progress towards a superconducting quantum interference device (SQUID) based system capable of detecting single atomic spin-flips. To date we have designed and had manufactured a niobium SQUID with a loop area of 3×10 −6 m by 3×10 −6 m. We present calculations which show that it is capable...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2000-05, Vol.280 (1), p.540-541
Main Authors: Josephs-Franks, P.W, Reed, R.P, Pakes, C.I
Format: Article
Language:English
Subjects:
Low-noise magnetometry
SQUID
STM
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Summary:We report progress towards a superconducting quantum interference device (SQUID) based system capable of detecting single atomic spin-flips. To date we have designed and had manufactured a niobium SQUID with a loop area of 3×10 −6 m by 3×10 −6 m. We present calculations which show that it is capable of detecting a few spins in a 1 Hz bandwidth, and experimental results are given which show that it operates close to the quantum-limit regime with the expected sensitivity. The SQUID is designed so that it will fit into a sample holder that will be loaded into a low-temperature ultra-high vacuum scanning tunnelling microscope (LT UHV STM). The STM will be used to image and manipulate trapped ad-atoms within the SQUID loop.
ISSN:0921-4526
1873-2135
DOI:10.1016/S0921-4526(99)01856-6