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Magnetic Imaging of Superconducting Tapes to Determine Current Flow

Published online by Cambridge University Press:  18 March 2011

G.W. Brown ,
M.E. Hawley ,
S.R. Foltyn  and
F.M. Mueller
G.W. Brown
Affiliation:
Structure/Property Relations (MST-8) Los Alamos National Laboratory, Los Alamos, NM 87545
M.E. Hawley
Affiliation:
Structure/Property Relations (MST-8) Los Alamos National Laboratory, Los Alamos, NM 87545
S.R. Foltyn
Affiliation:
Superconductivity Technology Center (MST-STC), Materials Science & Technology Division, Los Alamos National Laboratory, Los Alamos, NM 87545
F.M. Mueller
Affiliation:
Superconductivity Technology Center (MST-STC), Materials Science & Technology Division, Los Alamos National Laboratory, Los Alamos, NM 87545
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Abstract

We have developed a magnetic imaging system that uses magnetoresistive read heads from computer hard disk drives to map the transport-current-induced magnetic field at the surface of superconducting tapes at liquid nitrogen temperature. Transport current pathways are determined from the 2-dimensional magnetic field maps using established inversion schemes. We examined the current flow in pulsed-laser-deposited YBa2Cu3O7-σ films patterned on single crystal SrTiO3 substrates and on a textured yttria-stabilized-zirconia layer deposited on an Inconel ribbon by ion beam assisted deposition. The transport current densities in all cases were consistent with the Critical State Model. For the Inconel-based sample, the transport current density maps have allowed us to observe defects and determine the region that limits the current carrying capacity of the structure.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 659: Symposium II – High-Temperature Superconductors-Crystal Chemistry, Processing & Properties , 2000 , II7.4
Copyright
Copyright © Materials Research Society 2001

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