Article (Scientific journals)
Optimization of superconducting critical parameters by tuning the size and magnetization of arrays of magnetic dots
Silhanek, Alejandro; Gillijns, W.; Milosevic, M. V. et al.
2007In Physical Review. B, Condensed Matter and Materials Physics, 76 (10)
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Keywords :
superconductivity
Abstract :
[en] We investigate the nucleation of superconductivity in an Al film deposited on top of an array of micromagnets with perpendicular anisotropy by dc transport measurements. The absolute control of the magnetic state of the ferromagnets enabled us to explore the superconductor-normal-metal phase boundary as a function of the magnetization M of the dots. For a given external homogeneous field H, the magnetization of the dots can be tuned in such a way to optimize the field and current compensation in the sample, thus yielding a clear enhancement of the upper critical field H-c2. In addition, we theoretically demonstrate that the critical current I-c for a given temperature could be further enhanced by properly adjusting the size of the magnetic dots. These results are fully corroborated by the Ginzburg-Landau theory as well as analytic estimates.
Disciplines :
Physics
Author, co-author :
Silhanek, Alejandro  ;  Katholieke Universiteit Leuven - KUL
Gillijns, W.
Milosevic, M. V.
Volodin, A.
Moshchalkov, V. V.
Peeters, F. M.
Language :
English
Title :
Optimization of superconducting critical parameters by tuning the size and magnetization of arrays of magnetic dots
Publication date :
2007
Journal title :
Physical Review. B, Condensed Matter and Materials Physics
ISSN :
1098-0121
eISSN :
1550-235X
Publisher :
American Physical Society, Woodbury, United States - New York
Volume :
76
Issue :
10
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 08 November 2011

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