DC NanoSQUID from Nb Thin Films
V. Štrbík, M. Pisarčík, Š. Gaži and M. Španková
Institute of Electrical Engineering, Slovak Academy of Sciences, Dúbravská cesta 9, 84104 Bratislava, Slovakia
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We have prepared Nb thin film (thickness 80-100 nm) nanoSQUID with two symmetrically placed nanosized constrictions in superconducting loop. The nanoSQUID was prepared in two steps: at first a microsized SQUID was prepared and in the second step nanosized constrictions of the width of 120 nm in the SQUID loop were created by a focused ion beam technique. We studied the electrical and magnetic properties. From the obtained results, SQUID and constriction dimensions, the spin sensitivity was estimated to be about 50 μB Hz-1/2. Further improvement of spin sensitivity is possible by lowering the SQUID and constriction dimensions.

DOI: 10.12693/APhysPolA.131.1054
PACS numbers: 74.78.-w, 74.70.Ad, 85.25.Dq