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Three-dimensional nanoscale superconducting quantum interference device pickup loops

NanoSQUIDs are prime candidates for single-spin detection in many emerging technologies (spintronics, biomagnetics, nanoelectromagnetics, QIP). A critical problem is how to tightly integrate them on top of fragile magnetic systems without damage from photolithography. The paper solved this by demonstrating the first directly-written, freestanding nanoscale superconducting detector. Technique can also repair/modify expensive superconducting circuitry as Spanish/German groups subsequently demonstrated. Led to invited seminars at NIMS/Osaka University (Japan, 2012) and invited talk at the EU applied superconductivity conference (EUCAS2012). The basic technology developed led to further funding (EP/J007137/1, £797,878, PI: Romans) and an industrial PhD studentship with NPL (contact Jonathan Williams).