Dipole-induced vortex ratchets in superconducting films with arrays of micromagnets

[en] We investigate the transport properties of superconducting films with periodic arrays of in-plane magnetized micromagnets. Two different magnetic textures are studied: a square array of magnetic bars and a close-packed array of triangular microrings. As confirmed by magnetic force microscopy imaging, the magnetic state of both systems can be adjusted to produce arrays of almost pointlike magnetic dipoles. By carrying out transport measurements with ac drive, we observed experimentally a recently predicted ratchet effect induced by the interaction between superconducting vortices and the magnetic dipoles. Moreover, we find that these magnetic textures produce vortex-antivortex patterns, which have a crucial role in the transport properties of this hybrid system.

Disciplines :

Physics

Author, co-author :

de Souza Silva, C. C.

Silhanek, Alejandro ; Katholieke Universiteit Leuven - KUL

Van de Vondel, J.

Gillijns, W.

Metlushko, V.

Ilic, B.

Moshchalkov, V. V.

Language :

English

Title :

Dipole-induced vortex ratchets in superconducting films with arrays of micromagnets

Publication date :

2007

Journal title :

Physical Review Letters

ISSN :

0031-9007

eISSN :

1079-7114

Publisher :

American Physical Society, Ridge, United States - New York

Volume :

Issue :

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 10 November 2011

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