Influence of the thickness of the base Nb layer in a Josephson junction on magnetic flux trapping

•We prepared three Nb/Al-AlOx/Nb Josephson junctions with base Nb layer thicknesses of 100 nm, 500 nm, and 1000 nm.•We investigated the influence of the thickness of the base Nb layer on magnetic flux trapping in a Josephson junction.•We found that the magnetic flux became increasingly difficult to...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2021-08, Vol.587, p.1353897, Article 1353897
Main Authors: Hikosaka, Takuya, Watanabe, Norimichi, Abe, Susumu, Nakayama, Akiyoshi
Format: Article
Language:English
Subjects:
Aluminum
Josephson junctions
Magnetic fields
Magnetic flux
Magnetism
Niobium
PN junction devices
Studies
Superconductivity
Superconductors
Thickness
Thin films
Trapping
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Summary:•We prepared three Nb/Al-AlOx/Nb Josephson junctions with base Nb layer thicknesses of 100 nm, 500 nm, and 1000 nm.•We investigated the influence of the thickness of the base Nb layer on magnetic flux trapping in a Josephson junction.•We found that the magnetic flux became increasingly difficult to be trapped in the Nb superconducting thin film with increasing thickness of the Nb superconducting film. We measured the two-dimensional magnetic field dependence of a Josephson current by applying external magnetic fields Hx and Hy parallel to the plane of a Nb/Al-AlOx/Nb Josephson junction from two directions. In addition, we measured the modulation characteristics of the Josephson current by applying a magnetic field Hz in the direction perpendicular to the plane of the junction. When the perpendicular magnetic field Hz was applied to the Josephson junction and removed, the main peak of the Fraunhofer pattern did not return to the origin of the (Hx, Hy) plane completely because the magnetic flux was trapped in the Nb superconducting film around the Josephson junction. In the present study, we investigated the influence of the thickness of the base Nb layer on magnetic flux trapping in a Josephson junction by fabricating Josephson junctions with base Nb layers of different thickness. We found that the magnetic flux became increasingly difficult to be trapped in the Nb superconducting thin film with increasing thickness of the Nb superconducting film.
ISSN:0921-4534
1873-2143
DOI:10.1016/j.physc.2021.1353897