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.


M. Motta

Universidade Federal de Sao Carlos

F. Colauto

Universidade Federal de Sao Carlos

W. A. Ortiz

Universidade Federal de Sao 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 212601

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