NanoSQUIDs Based on Niobium Constrictions


Troeman, Aico G.P. and Derking, Hendrie and Borger, Bert and Pleikies, Johannes and Veldhuis, Dick and Hilgenkamp, Hans (2007) NanoSQUIDs Based on Niobium Constrictions. Nano Letters, 7 (7). pp. 2152-2156. ISSN 1530-6984

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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 A and flux sensitivities of 40-200 µV/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 µ0/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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Copyright:© 2007 American Chemical Society
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