Characterization of Lateral Junctions and Micro-SQUIDs Involving Magnetic Multilayers

Halima Giovanna Ahmad; Luigi Di Palma; Davide Massarotti; Marco Arzeo; Giovanni Piero Pepe; Francesco Tafuri; Oleg A. Mukhanov; Ivan P. Nevirkovets

doi:10.1109/TASC.2023.3247361

Characterization of Lateral Junctions and Micro-SQUIDs Involving Magnetic Multilayers

Halima Giovanna Ahmad, Luigi Di Palma, Davide Massarotti, Marco Arzeo, Giovanni Piero Pepe, Francesco Tafuri, Oleg A. Mukhanov, Ivan P. Nevirkovets

Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

We have fabricated and characterized at low temperatures Nb/Ni/(Al/Ni)14/Nb lateral junctions and Nb micro-SQUIDs involving (Al/Py)10 multilayers (here Py is permalloy: 80% Ni-20% Fe). We have studied I-V curves and Josephson critical current as a function of an external magnetic field (Ic(H)) at various temperatures and orientations of the applied magnetic field. These studies revealed that, for some orientations of the externally applied magnetic field, the Ic(H) dependence of the lateral junctions has a component highly sensitive to magnetic field. In addition, we have observed a SQUID-like Ic(H) dependence for devices, in which an orthogonally oriented (with respect to the substrate) Nb loop that includes two nanoscopic Josephson junctions is filled with a (Al/Py)10 multilayer. We believe the devices presented here are promising as magnetic field sensors on nanoscale for various applications where high spatial resolution is required.

Original language	English (US)
Article number	1101205
Journal	IEEE Transactions on Applied Superconductivity
Volume	33
Issue number	5
DOIs	https://doi.org/10.1109/TASC.2023.3247361
State	Published - Aug 1 2023

Keywords

Josephson junctions
Magnetic multilayers
magnetic sensors
SQUIDs

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1109/TASC.2023.3247361

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title = "Characterization of Lateral Junctions and Micro-SQUIDs Involving Magnetic Multilayers",

abstract = "We have fabricated and characterized at low temperatures Nb/Ni/(Al/Ni)14/Nb lateral junctions and Nb micro-SQUIDs involving (Al/Py)10 multilayers (here Py is permalloy: 80% Ni-20% Fe). We have studied I-V curves and Josephson critical current as a function of an external magnetic field (Ic(H)) at various temperatures and orientations of the applied magnetic field. These studies revealed that, for some orientations of the externally applied magnetic field, the Ic(H) dependence of the lateral junctions has a component highly sensitive to magnetic field. In addition, we have observed a SQUID-like Ic(H) dependence for devices, in which an orthogonally oriented (with respect to the substrate) Nb loop that includes two nanoscopic Josephson junctions is filled with a (Al/Py)10 multilayer. We believe the devices presented here are promising as magnetic field sensors on nanoscale for various applications where high spatial resolution is required.",

keywords = "Josephson junctions, Magnetic multilayers, magnetic sensors, SQUIDs",

author = "Ahmad, {Halima Giovanna} and {Di Palma}, Luigi and Davide Massarotti and Marco Arzeo and Pepe, {Giovanni Piero} and Francesco Tafuri and Mukhanov, {Oleg A.} and Nevirkovets, {Ivan P.}",

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AU - Ahmad, Halima Giovanna

AU - Di Palma, Luigi

AU - Massarotti, Davide

AU - Arzeo, Marco

AU - Pepe, Giovanni Piero

AU - Tafuri, Francesco

AU - Mukhanov, Oleg A.

AU - Nevirkovets, Ivan P.

PY - 2023/8/1

Y1 - 2023/8/1

N2 - We have fabricated and characterized at low temperatures Nb/Ni/(Al/Ni)14/Nb lateral junctions and Nb micro-SQUIDs involving (Al/Py)10 multilayers (here Py is permalloy: 80% Ni-20% Fe). We have studied I-V curves and Josephson critical current as a function of an external magnetic field (Ic(H)) at various temperatures and orientations of the applied magnetic field. These studies revealed that, for some orientations of the externally applied magnetic field, the Ic(H) dependence of the lateral junctions has a component highly sensitive to magnetic field. In addition, we have observed a SQUID-like Ic(H) dependence for devices, in which an orthogonally oriented (with respect to the substrate) Nb loop that includes two nanoscopic Josephson junctions is filled with a (Al/Py)10 multilayer. We believe the devices presented here are promising as magnetic field sensors on nanoscale for various applications where high spatial resolution is required.

AB - We have fabricated and characterized at low temperatures Nb/Ni/(Al/Ni)14/Nb lateral junctions and Nb micro-SQUIDs involving (Al/Py)10 multilayers (here Py is permalloy: 80% Ni-20% Fe). We have studied I-V curves and Josephson critical current as a function of an external magnetic field (Ic(H)) at various temperatures and orientations of the applied magnetic field. These studies revealed that, for some orientations of the externally applied magnetic field, the Ic(H) dependence of the lateral junctions has a component highly sensitive to magnetic field. In addition, we have observed a SQUID-like Ic(H) dependence for devices, in which an orthogonally oriented (with respect to the substrate) Nb loop that includes two nanoscopic Josephson junctions is filled with a (Al/Py)10 multilayer. We believe the devices presented here are promising as magnetic field sensors on nanoscale for various applications where high spatial resolution is required.

KW - Josephson junctions

KW - Magnetic multilayers

KW - magnetic sensors

KW - SQUIDs

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Characterization of Lateral Junctions and Micro-SQUIDs Involving Magnetic Multilayers

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