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@ARTICLE{Faley:825948,
author = {Faley, Michael and Kostyurina, E. A. and Diehle, Patrick
and Poppe, Ulrich and Kovacs, Andras and Maslennikov, Yuri
V. and Koshelets, Valery P. and Dunin-Borkowski, Rafal},
title = {{N}ondestructive {E}valuation {U}sing a {H}igh-{T} $_{c}$
{SQUID} {M}icroscope},
journal = {IEEE transactions on applied superconductivity},
volume = {27},
number = {4},
issn = {1558-2515},
address = {New York, NY},
publisher = {IEEE},
reportid = {FZJ-2017-00220},
pages = {1600905},
year = {2017},
abstract = {We report the application of a scanning high-Tc SQUID
(superconducting quantum interference device) microscope
with a ferromagnetic flux guide for the nondestructive
evaluation of weld seams and wear tracks and scars on
austenitic stainless steel plates as well as measurement of
magnetic stray fields distribution above patterned by
electron lithography 30-nm-thick cobalt films. A soft
magnetic amorphous Vitrovac foil was used to guide the flux
from the samples, which were held at room temperature, to
the liquid-nitrogen-cooled SQUID-sensor and back. The flux
guide passes through a hole in the 1 mm×2.5 mm pick-up loop
of the high-Tc SQUID sensor, thereby providing improved
coupling of the magnetic flux from the object to the SQUID.
In order to avoid the influence of the SQUID biasing the
magnetic field on the object under investigation, a
modulation and feedback coil was coupled to the pick-up loop
of the SQUID directly and beyond the ferromagnetic flux
guide. Such decoupling of feedback coil from soft magnetic
flux antenna ensures that the high-Tc SQUID microscope does
not disturb the sample magnetization during image recording.
The SQUID microscope can be used to measure the spatial
distribution of the z-component of the stray field above a
specimen without mechanical contact to it.},
cin = {PGI-5},
ddc = {530},
cid = {I:(DE-Juel1)PGI-5-20110106},
pnm = {144 - Controlling Collective States (POF3-144)},
pid = {G:(DE-HGF)POF3-144},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000391318100001},
doi = {10.1109/TASC.2016.2631419},
url = {https://juser.fz-juelich.de/record/825948},
}