Characterization of Lateral Junctions and Micro-SQUIDs Involving Magnetic Multilayers
Year: 2023
Authors: Ahmad HG., Di Palma L., Massarotti D., Arzeo M., Pepe GP., Tafuri F., Mukhanov OA., Nevirkovets IP.
Autors Affiliation: Univ Napoli Federico II, Dept Elect Engineer & Informat Technol, I-80126 Naples, Italy; CNR SPIN Napoli, UOS Monte St Angelo, I-80126 Naples, Italy; Univ Napoli Federico II, Dept Phys Ettore Pancini, I-80126 Naples, Italy; SEEQC EU, I-80146 Naples, Italy; Seeqc CESMA Quantum Joint Lab, I-80146 Naples, Italy; CNR Ist Nazl Ott CNR INO, I-50125 Florence, Italy; Seeqc Inc, Elmsford, NY 10523 USA; Northwestern Univ, Dept Phys & Astron, Evanston, IL 60201 USA.
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 (I-c(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 I-c(H) dependence of the lateral junctions has a component highly sensitive to magnetic field. In addition, we have observed a SQUID-like I-c(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.
Journal/Review: IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
Volume: 33 (5) Pages from: 1101205-1 to: 1101205-5
More Information: The work of Halima Giovanna Ahmad was supported by the project EffQul-Efficient integration of hybrid quantum devices-Ricerca diAteneo Linea A, CUP: under Grant E59C20001010005. The work of Ivan P.Nevirkovets was supported in part by NSF under Grant DMR 1905742 and in part by the NSF DISCoVER Expedition Award under Grant CCF-2124453.KeyWords: Magnetic multilayers; magnetic sensors; Josephson junctions; SQUIDsDOI: 10.1109/TASC.2023.3247361Citations: 1data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-09-15References taken from IsiWeb of Knowledge: (subscribers only)