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Effect of Helium Ion Irradiation on the Tunneling Behavior in Niobium/Aluminum/Aluminum Oxide/Niobium Josephson Junctions


Abstract The study of high energy particle irradiation effect on Josephson junction tri-layers is relevant to applications in space and radioactive environments. It also allows us to investigate the influence of defects and interfacial intermixing on the junction electrical characteristics. In this work, we studied the influence of 2MeV Helium ion irradiation with doses up to 5.2×1016 ions/cm2 on the tunneling behavior of Nb/Al/AlOx/Nb Josephson junctions. Structural and analytical TEM characterization, combined with SRIM modeling, indicates that over 4nm of intermixing occurred at the interfaces. EDX analysis after irradiation, suggests that the Al and O compositions from the barrier are collectively distributed together over a few nanometers. Surp... (more)
Created Date 2012
Contributor Zhang, Tiantian (Author) / Newman, Nathan (Advisor) / Rowell, John M (Committee member) / Singh, Rakesh K (Committee member) / Chamberlin, Ralph (Committee member) / Wang, Robert (Committee member) / Arizona State University (Publisher)
Subject Materials Science / Irradiation / Josephson Junctions / Tunneling Behavior
Type Masters Thesis
Extent 89 pages
Language English
Copyright
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Note M.S. Materials Science and Engineering 2012
Collaborating Institutions Graduate College / ASU Library
Additional Formats MODS / OAI Dublin Core / RIS


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Description Dissertation/Thesis