Investigating the intrinsic noise limit of Dayem bridge NanoSQUIDs

Patel, T, Li, B, Gallop, J, Cox, D, Kirkby, K, Romans, E, Chen, J, Nisbet, A and Hao, L (2015) Investigating the intrinsic noise limit of Dayem bridge NanoSQUIDs IEEE Transactions on Applied Superconductivity, 25 (3).

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Abstract

© 2014 IEEE.NanoSQUIDs made from Nb thin films have been produced with nanometre loop sizes down to 200 nm, using weak-link junctions with dimensions less than 60 nm. These composite (W/Nb) single layer thin film devices, patterned by FIB milling, show extremely good low-noise performance ~170 nΦ0 at temperatures between 5 and 8.5 K and can operate in rather high magnetic fields (at least up to 1 T). The devices produced so far have a limited operating temperature range, typically only 1-2 K. We have the goal of achieving operation at 4.2 K, to be compatible with the best SQUID series array (SSA) preamplifier available. Using the SSA to readout the nanoSQUIDs provides us with a means of investigating the intrinsic noise of the former. In this paper we report improved white noise levels of these nanoSQUIDs, enabling potential detection of a single electronic spin flip in a 1-Hz bandwidth. At low frequencies the noise performance is already limited by SSA preamplifier noise.

Item Type:	Article
Divisions :	Surrey research (other units)
Authors :	Name Email ORCID Patel, T Li, B Gallop, J Cox, D d.cox@surrey.ac.uk Kirkby, K Romans, E Chen, J Nisbet, A a.nisbet@surrey.ac.uk Hao, L
Date :	1 June 2015
DOI :	10.1109/TASC.2014.2364920
Depositing User :	Symplectic Elements
Date Deposited :	17 May 2017 13:33
Last Modified :	25 Jan 2020 00:07
URI:	http://epubs.surrey.ac.uk/id/eprint/839664

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