Electrically Tunable Multiterminal SQUID-on-Tip


Aviram Uri, Alexander Y. Meltzer, Yonathan Anahory, Lior Embon, Ella O. Lachman, Dorri Halbertal, H. R. Naren, Yuri Myasoedov, Martin E. Huber, Andrea F. Young, and Eli Zeldov. 2016. “Electrically Tunable Multiterminal SQUID-on-Tip.” NANO LETTERS, 16, 11, Pp. 6910-6915.


We present a new nanoscale superconducting quantum interference device (SQUID) whose interference pattern can be shifted electrically in situ. The device consists of a nanoscale four-terminal four-junction SQUID fabricated at the apex of a sharp pipet using a self-aligned three-step deposition of Pb. In contrast to conventional two-terminal-two-junction SQUIDs that display optimal sensitivity when flux biased to about a quarter of the flux quantum, the additional terminals and junctions allow optimal sensitivity at arbitrary applied flux, thus eliminating the magnetic field ``blind spots''. We demonstrate spin sensitivity of 5 to 8 mu B/Hz(1/2) over a continuous field range of 0 to 0.5 T with promising applications for nanoscale scanning magnetic imaging.