Superconducting quantum interference devices (SQUIDs) based on niobium nanobridges have been produced by means of focused ion beam milling. Typical critical currents of 4−25 μA and flux sensitivities of 40−200 μV/Φ 0 were measured for sensors based on 80 nm wide, 50 nm thick, and 150 nm long bridges. A white flux noise level of 1.5 μΦ 0 /Hz 1/2 was measured for a device with an area of 900 μm 2 and a critical current of 15 μA. The effective area of the smallest produced SQUID was 3.6 × 10 -2 μm 2 . Possible applications for such miniature SQUIDs are in scanning SQUID microscopy and the study of magnetic nanoparticles.
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Troeman et al. (2007) studied this question.
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