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Title: Signal performance of DC-SQUIDs with respect to YBCO thin film deposition rate
Authors: Avcı, I.
Algül, B. P.
Akram, R.
Bozbey, A.
Tepe, M.
Abukay, D.
Keywords: YBCO thin films
Deposition rate
Josephson junctions
Issue Date: 2009
Publisher: Elsevier Science Sa
Abstract: The signal performances of YBa2Cu3O7-delta (YBCO) direct current superconducting quantum interference devices (DC-SQUIDs) have been investigated as a function of the thin film structure affected by the growth process. YBCO thin films of 200 nm thicknesses were deposited by DC magnetron sputtering using different deposition rates between 1.0 nm/min and 2.0 nm/min onto 24 degrees bicrystal SrTiO3 (STO) substrates. The thin film samples were subsequently analyzed by XRD and AFM in order to determine their crystalline structures and surface morphologies respectively. The 67 pH directly coupled DC-SQUIDs with 4 mu m-wide bicrystal Josephson junctions were fabricated, and characterized with respect to their device performances. The variations in the critical current (l(c)), the voltage modulation depth (Delta V) and the noise performance of DC-SQUIDs were reported. The SQUIDs having relatively low deposition rate of 1.0 nm/min was observed to have larger voltage modulation depth as well as higher critical current than that of the samples having larger rate of 2.0 nm/min. The better noise performances were observed as the film deposition rate decreases. The results were associated with the thin film structure and the SQUID characteristics. (C) 2009 Elsevier B.V. All rights reserved.
ISSN: 0924-4247
Appears in Collections:Elektrik ve Elektronik Mühendisliği Bölümü / Department of Electrical & Electronics Engineering
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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