Dipole-Induced Vortex Ratchets in Superconducting Films with Arrays of Micromagnets

C. C. de Souza Silva, A. V. Silhanek, J. Van de Vondel, W. Gillijns, V. Metlushko, B. Ilic, and V. V. Moshchalkov
Phys. Rev. Lett. 98, 117005 – Published 15 March 2007

Abstract

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.

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  • Received 27 September 2006

DOI:https://doi.org/10.1103/PhysRevLett.98.117005

©2007 American Physical Society

Authors & Affiliations

C. C. de Souza Silva1,2,*, A. V. Silhanek1, J. Van de Vondel1, W. Gillijns1, V. Metlushko3, B. Ilic4, and V. V. Moshchalkov1

  • 1INPAC-Institue for Nanoscale Physics and Chemistry, Nanoscale Superconductivity and Magnetism & Pulsed Fields Group, Katholieke Universiteit Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
  • 2Departamento de Física, Universidade Federal de Pernambuco, 50670-901 Recife-PE, Brazil
  • 3Department of Electrical and Computer Engineering, University of Illinois, Chicago, Illinois 60607, USA
  • 4Cornell Nanofabrication Facility, School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA

  • *Electronic address: clecio@df.ufpe.br

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Issue

Vol. 98, Iss. 11 — 16 March 2007

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