Noise of a superconducting magnetic flux sensor based on a proximity Josephson junction

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Noise of a superconducting magnetic flux sensor based on a proximity Josephson junction. / Najafi Jabdaraghi, Robab; Golubev, Dmitry; Pekola, J.P.; Peltonen, Joonas.

In: Scientific Reports, Vol. 7, No. 1, 8011, 14.08.2017, p. 1-11.

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@article{15dc873d87334c019ab32e92e293af23,
title = "Noise of a superconducting magnetic flux sensor based on a proximity Josephson junction",
abstract = "We demonstrate simultaneous measurements of DC transport properties and flux noise of a hybrid superconducting magnetometer based on the proximity effect (superconducting quantum interference proximity transistor, SQUIPT). The noise is probed by a cryogenic amplifier operating in the frequency range of a few MHz. In our non-optimized device, we achieve minimum flux noise ~4 μΦ0/Hz1/2, set by the shot noise of the probe tunnel junction. The flux noise performance can be improved by further optimization of the SQUIPT parameters, primarily minimization of the proximity junction length and cross section. Furthermore, the experiment demonstrates that the setup can be used to investigate shot noise in other nonlinear devices with high impedance. This technique opens the opportunity to measure sensitive magnetometers including SQUIPT devices with very low dissipation.",
author = "{Najafi Jabdaraghi}, Robab and Dmitry Golubev and J.P. Pekola and Joonas Peltonen",
year = "2017",
month = "8",
day = "14",
doi = "10.1038/s41598-017-08710-7",
language = "English",
volume = "7",
pages = "1--11",
journal = "Scientific Reports",
issn = "2045-2322",
publisher = "Nature Publishing Group",
number = "1",

}

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TY - JOUR

T1 - Noise of a superconducting magnetic flux sensor based on a proximity Josephson junction

AU - Najafi Jabdaraghi, Robab

AU - Golubev, Dmitry

AU - Pekola, J.P.

AU - Peltonen, Joonas

PY - 2017/8/14

Y1 - 2017/8/14

N2 - We demonstrate simultaneous measurements of DC transport properties and flux noise of a hybrid superconducting magnetometer based on the proximity effect (superconducting quantum interference proximity transistor, SQUIPT). The noise is probed by a cryogenic amplifier operating in the frequency range of a few MHz. In our non-optimized device, we achieve minimum flux noise ~4 μΦ0/Hz1/2, set by the shot noise of the probe tunnel junction. The flux noise performance can be improved by further optimization of the SQUIPT parameters, primarily minimization of the proximity junction length and cross section. Furthermore, the experiment demonstrates that the setup can be used to investigate shot noise in other nonlinear devices with high impedance. This technique opens the opportunity to measure sensitive magnetometers including SQUIPT devices with very low dissipation.

AB - We demonstrate simultaneous measurements of DC transport properties and flux noise of a hybrid superconducting magnetometer based on the proximity effect (superconducting quantum interference proximity transistor, SQUIPT). The noise is probed by a cryogenic amplifier operating in the frequency range of a few MHz. In our non-optimized device, we achieve minimum flux noise ~4 μΦ0/Hz1/2, set by the shot noise of the probe tunnel junction. The flux noise performance can be improved by further optimization of the SQUIPT parameters, primarily minimization of the proximity junction length and cross section. Furthermore, the experiment demonstrates that the setup can be used to investigate shot noise in other nonlinear devices with high impedance. This technique opens the opportunity to measure sensitive magnetometers including SQUIPT devices with very low dissipation.

U2 - 10.1038/s41598-017-08710-7

DO - 10.1038/s41598-017-08710-7

M3 - Article

VL - 7

SP - 1

EP - 11

JO - Scientific Reports

JF - Scientific Reports

SN - 2045-2322

IS - 1

M1 - 8011

ER -

ID: 13225083