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 pipette 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 μB/Hz1/2 over a continuous field range of 0 to 0.5 T, with promising applications for nanoscale scanning magnetic imaging.
@article{arxiv.1606.05088,
title = {Electrically tunable multi-terminal SQUID-on-tip},
author = {Aviram Uri and Alexander Y. Meltzer and Yonathan Anahory and Lior Embon and Ella O. Lachman and Dorri Halbertal and Naren HR and Yuri Myasoedov and Martin E. Huber and Andrea Young and Eli Zeldov},
journal= {arXiv preprint arXiv:1606.05088},
year = {2017}
}