Development of miniature DC SQUID devices for the detection of single atomic spin-flips

We report progress toward a superconducting quantum interference device (SQUID)-based system capable of detecting a few atomic spin-flips. The scaling of the flux sensitivity with SQUID loop dimension of miniature niobium dc SQUID devices is examined and shown experimentally to vary as predicted. Ou...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2001-04, Vol.50 (2), p.310-313
Main Authors: Pakes, C.I., Josephs-Franks, P.W., Reed, R.P., Corner, S.G., Colclough, M.S.
Format: Article
Language:English
Subjects:
Bandwidth
Devices
Dielectric measurements
Direct current
Extraterrestrial measurements
Magnetic materials
Miniature
Nanocomposites
Nanomaterials
Nanostructure
Niobium
Probes
Quantum computing
Size measurement
SQUIDs
Superconducting quantum interference devices
Temperature sensors
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Summary:We report progress toward a superconducting quantum interference device (SQUID)-based system capable of detecting a few atomic spin-flips. The scaling of the flux sensitivity with SQUID loop dimension of miniature niobium dc SQUID devices is examined and shown experimentally to vary as predicted. Our smallest device, with loop size 3 /spl mu/m/spl times/3 /spl mu/m, is capable of detecting 40 spins in a 1-Hz bandwidth. We address the task of depositing a sample, of nanoscale dimension, within the SQUID loop.
ISSN:0018-9456
1557-9662
DOI:10.1109/19.918129