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Highly-packed proximity-coupled DC Josephson junction arrays by a direct-write approach

  • Focused ion beam induced deposition (FIBID) is a direct-write technique enabling the growth of individual nanostructures of any shape and dimension with high lateral resolution. Moreover, the fast and reliable writing of periodically arranged nanostructures can be used to fabricate devices for the investigation of collective phenomena and to design novel functional metamaterials. Here, FIBID is employed to prepare dc-Josephson junction arrays (dc-JJA) consisting of superconducting NbC dots coupled through the proximity effect via a granular metal layer. The fabrication is straightforward and allows the preparation of dc-JJA within a few seconds. Microstructure and composition of the arrays are investigated by transmission electron microscopy and energy dispersive X-ray spectroscopy. The superconductor-to-metal transition of the prepared dc-JJA is studied in a direct way, by tuning the Josephson junction resistance in 70 nm-spaced superconducting NbC dots. The observed magnetoresistance oscillations with a period determined by the flux quantum give evidence for the coherent charge transport by paired electrons. Moreover, the measured resistance minima correspond to two fundamental matching configurations of fluxons in the dc-JJA, caused by magnetic frustration. The robust properties of the prepared dc-JJA demonstrate the opportunities for a fast preparation of complex device configurations using direct-write approaches.
Metadaten
Author:Fabrizio PorratiORCiD, Felix JungwirthORCiDGND, Sven BarthORCiDGND, Gian Carlo Gazzadi, Stefano FrabboniORCiD, Oleksandr V. DobrovolskiyORCiDGND, Michael HuthORCiDGND
URN:urn:nbn:de:hebis:30:3-735086
DOI:https://doi.org/10.1002/adfm.202203889
ISSN:1616-3028
Parent Title (English):Advanced functional materials
Publisher:Wiley-VCH
Place of publication:Weinheim
Document Type:Article
Language:English
Date of Publication (online):2022/07/01
Date of first Publication:2022/07/01
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2023/04/14
Tag:Josephson junction arrays; NbC; direct-write fabrications; focused ion beam induced depositions; magnetic frustration; nanolithography; superconductor-to-metal transition
Volume:32.2022
Issue:36, art. 2203889
Article Number:2203889
Page Number:9
First Page:1
Last Page:8
Note:
Support through the Frankfurt Center of Electron Microscopy (FCEM) and the European Cooperation in Science and Technology via COST Action No. CA16218 (NANOCOHYBRI) are gratefully acknowledged.
Note:
Open access funding enabled and organized by Projekt DEAL.
Note:
The data that support the findings of this study are available from the corresponding author upon reasonable request.
HeBIS-PPN:508538378
Institutes:Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Sammlungen:Universitätspublikationen
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International