학술논문

Analysis of Multilayer Devices for Superconducting Electronics by High-Resolution Scanning Transmission Electron Microscopy and Energy Dispersive Spectroscopy
Document Type
Periodical
Source
IEEE Transactions on Applied Superconductivity IEEE Trans. Appl. Supercond. Applied Superconductivity, IEEE Transactions on. 27(4):1-4 Jun, 2017
Subject
Fields, Waves and Electromagnetics
Engineered Materials, Dielectrics and Plasmas
Niobium
Electrodes
Junctions
Magnetic multilayers
Standards
Nickel
Nonhomogeneous media
Josephson junctions
magnetic multilayers
superconducting materials
scanning transmission electron microscopy
Language
ISSN
1051-8223
1558-2515
2378-7074
Abstract
A focused ion beam was used to obtain cross-sectional specimens from both magnetic multilayer and Nb/Al-AlOx/Nb Josephson junction devices for characterization by scanning transmission electron microscopy (STEM) and energy dispersive X-ray spectroscopy (EDX). Automated multivariate statistical analysis of the EDX spectral images produced chemically unique component images of individual layers within the multilayer structures. STEM imaging elucidated distinct variations in film morphology, interface quality, and/or etch artifacts that could be correlated to magnetic and/or electrical properties measured on the same devices.