Abstract
Magnetic nanoparticles are widely applicable in systems ranging from spintronics and data storage to biomedical imaging and cancer treatment. However, studying these particles requires ultrasensitive detectors. Superconducting quantum interference devices (SQUIDs) are the finest detectors of magnetic flux, but for this purpose they must be drastically miniaturized. To this end, the authors have fabricated nanosSQUIDs of exquisite sensitivity that will facilitate both basic and applied research on nanoscale spin systems.
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