Enhanced pinning in superconducting thin films with graded pinning landscapes
Journal article, 2013
A graded distribution of antidots in superconducting a-Mo79Ge21 thin films has been investigated by magnetization and magneto-optical imaging measurements. The pinning landscape has maximum density at the sample border, decreasing linearly towards the center. Its overall performance is noticeably superior than that for a sample with uniformly distributed antidots: For high temperatures and low fields, the critical current is enhanced, whereas the region of thermomagnetic instabilities in the field-temperature diagram is significantly suppressed. These findings confirm the relevance of graded landscapes on the enhancement of pinning efficiency, as recently predicted by Misko and Nori.
Author
M. Motta
Federal University of São Carlos
F. Colauto
Federal University of São Carlos
W. A. Ortiz
Federal University of São Carlos
Joachim Fritzsche
Chalmers, Applied Physics, Chemical Physics
J. Cuppens
KU Leuven
W. Gillijns
KU Leuven
V. V. Moshchalkov
KU Leuven
T. H. Johansen
University of Oslo
University of Wollongong
A. Sanchez
Universitat Autonoma de Barcelona (UAB)
A. V. Silhanek
University of Liège
Applied Physics Letters
0003-6951 (ISSN) 1077-3118 (eISSN)
Vol. 102 21 212601Subject Categories (SSIF 2011)
Other Engineering and Technologies
DOI
10.1063/1.4807848