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Development of a niobium nanosuperconducting quantum interference device for the detection of small spin populations

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2 Author(s)
Lam, S.K.H. ; CSIRO, Telecommunications and Industrial Physics, P.O. Box 218, Lindfield, NSW 2070, Australia ; Tilbrook, D.L.

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Electron-beam lithography and reactive ion etching have been used to fabricate thin-film Au/Nb bridges with widths ∼50 nm. The Au layer was used as both a mask for etching the Nb superconducting bridge and as a resistive shunt in the completed devices. Using these junctions, a dc superconducting quantum interference device (SQUID) design with a hole size of 200 nm×200 nm (nano-SQUID) has also been fabricated and characterized. A flux noise of approximately 7×10-6 Φ0/Hz1/2 at 4.2 K has been achieved, from which a calculated spin sensitivity of 250 spin/Hz1/2 is predicted. © 2003 American Institute of Physics.

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Applied Physics Letters  (Volume:82 ,  Issue: 7 )