Article (Scientific journals)
Self-organized mode-locking effect in superconductor/ferromagnet hybrids
Van de Vondel, J.; Silhanek, Alejandro; Metlushko, V. et al.
2009In Physical Review. B, Condensed Matter, 79 (5)
Peer Reviewed verified by ORBi
 

Files


Full Text
VandeVondel-PRB-09.pdf
Publisher postprint (1.24 MB)
Request a copy

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
critical currents; ferromagnetic materials; flux flow; Josephson effect; magnetic force microscopy; Permalloy; remanence; superconducting materials
Abstract :
[en] The vortex dynamics in a low-temperature superconductor deposited on top of a rectangular array of micrometer size permalloy triangles is investigated experimentally. The rectangular unit cell is such that neighboring triangles physically touch each other along one direction. This design stabilizes remanent states which differ from the magnetic vortex state typical of individual noninteracting triangles. Magnetic force microscopy images have revealed that the magnetic landscape of the template can be switched to an ordered configuration after magnetizing the sample with an in-plane field. The ordered phase exhibits a broad flux-flow regime with relatively low critical current and a highly anisotropic response. This behavior is caused by the spontaneous formation of two separated rows of vortices and antivortices along each line of connected triangles. The existence of a clear flux-flow regime at zero external field supports this interpretation. The density of induced vortex-antivortex pairs is directly obtained using a high-frequency measurement technique which allows us to resolve the discrete motion of vortices. Strikingly, the presence of vortex-antivortex rows gives rise to a self-organized synchronized motion of vortices which manifests itself as field independent Shapiro steps in the current-voltage characteristics.
Disciplines :
Physics
Author, co-author :
Van de Vondel, J.
Silhanek, Alejandro  ;  Katholieke Universiteit Leuven - KUL
Metlushko, V.
Vavassori, P.
Ilic, B.
Moshchalkov, V. V.
Language :
English
Title :
Self-organized mode-locking effect in superconductor/ferromagnet hybrids
Publication date :
2009
Journal title :
Physical Review. B, Condensed Matter
ISSN :
0163-1829
eISSN :
1095-3795
Publisher :
American Institute of Physics, New York, United States - New York
Volume :
79
Issue :
5
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 10 November 2011

Statistics


Number of views
46 (0 by ULiège)
Number of downloads
0 (0 by ULiège)

Scopus citations®
 
17
Scopus citations®
without self-citations
10
OpenCitations
 
18

Bibliography


Similar publications



Contact ORBi