High-Quality Ferromagnetic Josephson Junctions Based on Aluminum Electrodes

Year: 2022

Authors: Vettoliere A., Satariano R., Ferraiuolo R., Di Palma L., Ahmad HG., Ausanio G., Pepe GP., Tafuri F., Massarotti D., Montemurro D., Granata C., Parlato L.

Autors Affiliation: CNR ISASI, Via Campi Flegrei 34, I-80078 Pozzuoli, Italy; Univ Napoli Federico II, Dipartimento Fis Ettore Pancini, I-80125 Naples, Italy; CNR SPIN, Complesso Monte St Angelo,Via Cinthia, I-80126 Naples, Italy; Univ Napoli Federico II, Dipartimento Ingn Elettr & Tecnol Informaz, I-80125 Naples, Italy; CNR Ist Nazl Ott CNR INO, Largo Enr Fermi 6, I-50125 Florence, Italy.

Abstract: Aluminum Josephson junctions are the building blocks for the realization of superconducting quantum bits. Attention has been also paid to hybrid ferromagnetic Josephson junctions, which allow switching between different magnetic states, making them interesting for applications such as cryogenic memories, single-photon detectors, and spintronics. In this paper, we report on the fabrication and characterization of high-quality ferromagnetic Josephson junctions based on aluminum technology. We employed an innovative fabrication process inspired by niobium-based technology, allowing us to obtain very high-quality hybrid aluminum Josephson junctions; thus, supporting the use of ferromagnetic Josephson junctions in advanced quantum circuits. The fabrication process is described in detail and the main DC transport properties at low temperatures (current-voltage characteristic, critical current as a function of the temperature, and the external magnetic field) are reported. Here, we illustrate in detail the fabrication process, as well as the main DC transport properties at low temperatures (current-voltage characteristic, critical current as a function of the temperature, and the external magnetic field).

Journal/Review: NANOMATERIALS

Volume: 12 (23)      Pages from: 4155-1  to: 4155-9

More Information: The work was supported by the project EffQul-Efficient integration of hybrid quantum devices-Ricerca di Ateneo Linea A, CUP: E59C20001010005; and the project SQUAD-On-chip control and advanced read-out for superconducting qubit arrays, Programma STAR PLUS 2020, Finanziamento della Ricerca di Ateneo, University of Napoli Federico II.
KeyWords: aluminum Josephson junctions; hybrid ferromagnetic Josephson junction; quantum computing applications
DOI: 10.3390/nano12234155

ImpactFactor: 5.300
Citations: 8
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