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Micromachines
Special Issues
Nano and Micro Superconducting Quantum Interference Devices
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Nano and Micro Superconducting Quantum Interference Devices

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "A：Physics".

Deadline for manuscript submissions: closed (31 October 2021) | Viewed by 6080

Special Issue Editors

Dr. Antonio Vettoliere

E-Mail Website
Guest Editor
Institute of Applied Sciences and Intelligent Systems, National Research Council, 80078 Pozzuoli (Napoli), Italy
Interests: superconducting quantum interference devices; high-sensitive superconducting magnetometers; nanomagnetism; magnetoencephalography; organic TFT
Special Issues, Collections and Topics in MDPI journals
Dr. Carmine Granata

E-Mail Website
Guest Editor
Institute of Applied Sciences and Intelligent Systems "E. Caianiello", National Research Council, Via Campi Flegrei, 34, 80078 Pozzuoli (Napoli), Italy
Interests: superconducting quantum interference devices; Josephson junctions; highly sensitive superconducting magnetometers; nanomagnetism; magnetoencephalography
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Superconducting quantum interference devices (SQUIDs) are among the most sensitive detectors of magnetic flux available, having at the same time high versatility. Being a flux to voltage converter, the SQUID can measure all physical quantities that can be converted into magnetic flux, for example, magnetic field, magnetic field gradients, current, voltage, displacement, or magnetic susceptibility. The SQUID exhibits an equivalent energy sensitivity that approaches the quantum limit; therefore, it is often employed in very interesting experiments of basic physics, including the detection of Hawking radiation, the dynamical Casimir effect, the Majorana fermions investigations, the effects of the quantum gravity, and detection gravitational waves. Thanks to their very high performance together with their robustness and reliability, SQUID-based devices are widely used in several applications, such as biomagnetism, magnetic microscopy, non-destructive evaluation, geophysics, astrophysics, quantum information, and particle physics. More recently, great efforts have been devoted to the development of nanosized SQUID (nanoSQUID) as a powerful tool for nanoscale applications since it exhibits an ultra-high magnetic moment sensitivity that approaches a single spin per unit of bandwidth and allows the detection of direct magnetization change in small clusters of nanoparticles. The aim of this Special Issue is to collect and highlight recent advances in every aspect from the design to the applications of SQUIDs at micrometric and nanometric resolution. Both original research articles and reviews are encouraged.

Dr. Antonio Vettoliere
Prof. Carmine Granata
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Micromachines is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Dc-SQUIDs
  • Rf-SQUIDs
  • MicroSQUIDs
  • NanoSQUIDs
  • SQUID voltmeters and amperometers
  • SQUID radio frequency amplifiers
  • Superconducting quantum interference filters (SQUIFs)
  • Magnetometers and gradiometers
  • SQUID arrays
  • SQUID readout
  • Magnetoencephalography
  • Nanomagnetism
  • Nondestructive evaluation (NDE)
  • Geophysics
  • Susceptometry
  • Highly spatial resolution magnetic microscopy
  • Highly sensitive thermometry
  • Magnetic relaxation immunoassay
  • Low field nuclear magnetic resonance
  • Basic physics experiments

Published Papers (2 papers)

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Research

16 pages, 481 KiB  
Article
Evaluation of Self-Field Effects in Magnetometers Based on Meander-Shaped Arrays of Josephson Junctions or SQUIDs Connected in Series
by Denis Crété, Julien Kermorvant, Yves Lemaître, Bruno Marcilhac, Salvatore Mesoraca, Juan Trastoy and Christian Ulysse
Micromachines 2021, 12(12), 1588; https://doi.org/10.3390/mi12121588 - 20 Dec 2021
Cited by 3 | Viewed by 2390
Abstract
Arrays of superconducting quantum interference devices (SQUIDs) are highly sensitive magnetometers that can operate without a flux-locked loop, as opposed to single SQUID magnetometers. They have no source of ambiguity and benefit from a larger bandwidth. They can be used to measure absolute [...] Read more.
Arrays of superconducting quantum interference devices (SQUIDs) are highly sensitive magnetometers that can operate without a flux-locked loop, as opposed to single SQUID magnetometers. They have no source of ambiguity and benefit from a larger bandwidth. They can be used to measure absolute magnetic fields with a dynamic range scaling as the number of SQUIDs they contain. A very common arrangement for a series array of SQUIDs is with meanders as it uses the substrate area efficiently. As for most layouts with long arrays, this layout breaks the symmetry required for the elimination of adverse self-field effects. We investigate the scaling behavior of series arrays of SQUIDs, taking into account the self-field generated by the bias current flowing along the meander. We propose a design for the partial compensation of this self-field. In addition, we provide a comparison with the case of series arrays of long Josephson junctions, using the Fraunhofer pattern for applications in magnetometry. We find that compensation is required for arrays of the larger size and that, depending on the technology, arrays of long Josephson junctions may have better performance than arrays of SQUIDs. Full article
(This article belongs to the Special Issue Nano and Micro Superconducting Quantum Interference Devices)
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16 pages, 6396 KiB  
Article
Fabrication Process for Deep Submicron SQUID Circuits with Three Independent Niobium Layers
by Silke Wolter, Julian Linek, Josepha Altmann, Thomas Weimann, Sylke Bechstein, Reinhold Kleiner, Jörn Beyer, Dieter Koelle and Oliver Kieler
Micromachines 2021, 12(4), 350; https://doi.org/10.3390/mi12040350 - 24 Mar 2021
Cited by 1 | Viewed by 2429
Abstract
We present a fabrication technology for nanoscale superconducting quantum interference devices (SQUIDs) with overdamped superconductor-normal metal-superconductor (SNS) trilayer Nb/HfTi/Nb Josephson junctions. A combination of electron-beam lithography with chemical-mechanical polishing and magnetron sputtering on thermally oxidized Si wafers is used to produce direct current [...] Read more.
We present a fabrication technology for nanoscale superconducting quantum interference devices (SQUIDs) with overdamped superconductor-normal metal-superconductor (SNS) trilayer Nb/HfTi/Nb Josephson junctions. A combination of electron-beam lithography with chemical-mechanical polishing and magnetron sputtering on thermally oxidized Si wafers is used to produce direct current SQUIDs with 100-nm-lateral dimensions for Nb lines and junctions. We extended the process from originally two to three independent Nb layers. This extension offers the possibility to realize superconducting vias to all Nb layers without the HfTi barrier, and hence to increase the density and complexity of circuit structures. We present results on the yield of this process and measurements of SQUID characteristics. Full article
(This article belongs to the Special Issue Nano and Micro Superconducting Quantum Interference Devices)
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