Aluminum-ferromagnetic Josephson tunnel junctions for high quality magnetic switching devices

Year: 2022

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

Autors Affiliation: Consiglio Nazl Ric ISASI, Pozzuoli, Italy; Univ Napoli Federico II, Dipartimento Fis Ettore Pancini, Naples, Italy; Univ Napoli Federico II, Dipartimento Ingn Elettr & Tecnol Informaz, Naples, Italy; Consiglio Nazl Ric SPIN, Pozzuoli, Italy; Consiglio Nazl Ric Ist Nazl Ott CNR INO, Pozzuoli, Italy.

Abstract: The competition between superconducting and ferromagnetic orderings in Josephson devices has promoted fundamental and applicative studies of high impact for superconducting digital technology, cryogenic memories, and spintronics, where the possibility of switching between different magnetic states is a crucial advantage. Here, we report on fabrication and characterization of very high quality tunnel ferromagnetic Josephson junctions (JJs) with aluminum electrodes, demonstrating hysteretic behavior of the magnetic field pattern preserving typical transport properties of Al junctions, underdamped behavior, and very low quasiparticle dissipation. The proposed technology paves the way for the possible implementation of Al tunnel-ferromagnetic JJs in superconducting quantum circuits, toward alternative approaches based on digital control of the Josephson device.

Journal/Review: APPLIED PHYSICS LETTERS

Volume: 120 (26)      Pages from: 262601-1  to: 262601-6

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. H.G.A., D.Ma., and F.T. thank NANOCOHYBRI project (COST Action CA 16218). D.Mo acknowledges Progetto PON R&I 2014-2020 AIM: Attraction and Inte rnational Mobility.
KeyWords: Superconductor
DOI: 10.1063/5.0101686

Citations: 8
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