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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 μ≤300μB). 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.
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Vohralik et al. (2009) studied this question.
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