Extremely sensitive and ultrasmall superconducting quantum interference devices can be fabricated on sharp nanoscale tips.
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Koelle, D. A tip for better sensing. Nature Nanotech 8, 617–618 (2013). https://doi.org/10.1038/nnano.2013.179
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DOI: https://doi.org/10.1038/nnano.2013.179
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