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arXiv · 1606.05088

Electrically tunable multi-terminal SQUID-on-tip

Aviram Uri·Alexander Y. Meltzer·Yonathan Anahory·Lior Embon·Ella O. Lachman·Dorri Halbertal·Naren HR·Yuri Myasoedov·Martin E. Huber·Andrea Young·Eli Zeldov
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Abstract

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 $\mu_B/\text{Hz}^{1/2}$ over a continuous field range of 0 to 0.5 T, with promising applications for nanoscale scanning magnetic imaging.

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Aviram Uri, Alexander Y. Meltzer, Yonathan Anahory, Lior Embon, Ella O. Lachman, Dorri Halbertal, Naren HR, Yuri Myasoedov, Martin E. Huber, Andrea Young, Eli Zeldov. 2016-06-16. Electrically tunable multi-terminal SQUID-on-tip. https://doi.org/10.1021/acs.nanolett.6b02841

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