NanoSQUID detection of magnetization from ferritin nanoparticles

A gold-shunted Nb nanoSQUID (SQUID: superconducting quantum interference device) operated in open-loop current-biased mode has been used to measure flux changes in the presence of nearby nanoparticles of native horse-spleen ferritin (magnetic moment mu < or = 300mub). The ferritin nanoparticles w...

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Bibliographic Details
Published in:Superconductor science & technology 2009-06, Vol.22 (6), p.064007-64007
Main Authors: Vohralik, P F, Lam, S K H
Format: Article
Language:English
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Summary:A gold-shunted Nb nanoSQUID (SQUID: superconducting quantum interference device) operated in open-loop current-biased mode has been used to measure flux changes in the presence of nearby nanoparticles of native horse-spleen ferritin (magnetic moment mu < or = 300mub). The ferritin nanoparticles were attached to one of the nanobridge junctions using appropriately functionalized organic linker molecules. Calculations of the coupling between an idealized nanoSQUID and a nearby ferritin magnetic moment are used to illustrate the dependence of the coupled flux on the nanoparticle-nanoSQUID separation and the dimensions of the SQUID loop. Flux changes calculated for the reversal of a ferritin magnetic moment coupled to the nanoSQUID are consistent with some, but not all, of the measured flux changes. Further studies are needed to determine the mechanisms involved.
ISSN:0953-2048
1361-6668
DOI:10.1088/0953-2048/22/6/064007