Title :
Noise Performance of Niobium Nano-SQUIDs in Applied Magnetic Fields
Author :
Romans, Edward J. ; Rozhko, Sergei ; Young, Laurence ; Blois, Arnaud ; Hao, Ling ; Cox, David ; Gallop, John C.
Author_Institution :
London Centre for Nanotechnol., Univ. Coll. London, London, UK
fDate :
6/1/2011 12:00:00 AM
Abstract :
We have fabricated two different designs of niobium dc nano-SQUIDs using focussed ion beam (FIB) lithography with loops and track widths down to 70 nm. We report on the voltage-flux and noise performance of the devices in zero field and with magnetic fields of up to 1 T applied either in-plane or perpendicular to the plane at temperatures between 5 K and 9 K. We compare the measurements with modeled estimates of the inductance of the structures and the conventional theory of noise in dc SQUIDs.
Keywords :
SQUIDs; focused ion beam technology; lithography; magnetic fields; niobium; superconducting device noise; FIB lithography; focussed ion beam; magnetic field; niobium nano-SQUIDs; noise performance; voltage-flux; Inductance; Magnetic tunneling; Niobium; Noise; SQUIDs; Superconducting magnets; Temperature measurement; Magnetic field sensitivity; nanoscale SQUID; superconducting quantum interference device;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2010.2090851
