Abstract
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 thepresence of nearby nanoparticles of native horse-spleen ferritin (magnetic momentμ≤300μB). The ferritin nanoparticles were attached to one of the nanobridge junctions usingappropriately functionalized organic linker molecules. Calculations of the coupling betweenan idealized nanoSQUID and a nearby ferritin magnetic moment are used to illustrate thedependence of the coupled flux on the nanoparticle–nanoSQUID separation and thedimensions of the SQUID loop. Flux changes calculated for the reversal of a ferritinmagnetic moment coupled to the nanoSQUID are consistent with some, but not all, of themeasured flux changes. Further studies are needed to determine the mechanismsinvolved.
Published Version
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