NanoSQUIDs Based on Niobium Constrictions
Nano Letters2007Vol. 7(7), pp. 2152–2156
Citations Over TimeTop 1% of 2007 papers
Abstract
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/Φ0 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 μΦ0/Hz1/2 was measured for a device with an area of 900 μm2 and a critical current of 15 μA. The effective area of the smallest produced SQUID was 3.6 × 10-2 μm2. Possible applications for such miniature SQUIDs are in scanning SQUID microscopy and the study of magnetic nanoparticles.
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