Electrically Tunable Multiterminal SQUID-on-Tip.
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 μB/Hz1/2over a continuous field range of 0 to 0.5 T with promising applications for nanoscale scanning magnetic imaging.
Department of Condensed Matter Physics, Weizmann Institute of Science , Rehovot 7610001, Israel.
Aviram
A
Uri
Department of Condensed Matter Physics, Weizmann Institute of Science , Rehovot 7610001, Israel.
Alexander Y
AY
Meltzer
Department of Condensed Matter Physics, Weizmann Institute of Science , Rehovot 7610001, Israel.
Yonathan
Y
Anahory
Department of Condensed Matter Physics, Weizmann Institute of Science , Rehovot 7610001, Israel.
Lior
L
Embon
Department of Condensed Matter Physics, Weizmann Institute of Science , Rehovot 7610001, Israel.
Ella O
EO
Lachman
Department of Condensed Matter Physics, Weizmann Institute of Science , Rehovot 7610001, Israel.
Dorri
D
Halbertal
Department of Condensed Matter Physics, Weizmann Institute of Science , Rehovot 7610001, Israel.
Naren
N
Hr
Department of Condensed Matter Physics, Weizmann Institute of Science , Rehovot 7610001, Israel.
Yuri
Y
Myasoedov
Department of Condensed Matter Physics, Weizmann Institute of Science , Rehovot 7610001, Israel.|Departments of Physics and Electrical Engineering, University of Colorado , Denver, Colorado 80217, United States.
Martin E
ME
Huber
Department of Condensed Matter Physics, Weizmann Institute of Science , Rehovot 7610001, Israel.|Department of Physics, University of California , Broida Hall, Santa Barbara, California 93106, United States.
Andrea F
AF
Young
Department of Condensed Matter Physics, Weizmann Institute of Science , Rehovot 7610001, Israel.
Eli
E
Zeldov
SQUID-on-tip; Superconducting quantum interference device; current-phase relations; nanoscale magnetic imaging