Vortex-antivortex dynamics and field-polarity-dependent flux creep in hybrid superconductor/ferromagnet nanostructures

M. Lange, M. J. Van Bael, A. V. Silhanek, and V. V. Moshchalkov

Phys. Rev. B 72, 052507 – Published 22 August 2005

Abstract

Vortex-antivortex arrays (VAA) that are created in a type-II superconducting film by lattices of ferromagnetic dots with perpendicular anisotropy have been investigated. The highest critical current is shifted to a nonzero value of the applied field, and current-voltage characteristics show different regimes of vortex motion even in zero-applied field due to the presence of the VAA. Creep of interstitial vortices is observed at low driving forces. This flux creep is strongly field-polarity dependent.

Received 15 April 2005

DOI:https://doi.org/10.1103/PhysRevB.72.052507

Authors & Affiliations

M. Lange^*, M. J. Van Bael, A. V. Silhanek, and V. V. Moshchalkov^†

Nanoscale Superconductivity and Magnetism Group, Laboratory for Solid State Physics and Magnetism, K.U.Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium

^*Present address: nv Bekaert sa, Bekaertstraat 2, 8550 Zwevegem, Belgium
^†Electronic address: victor.moshchalkov@fys.kuleuven.ac.be

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Issue

Vol. 72, Iss. 5 — 1 August 2005

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Physical Review B

covering condensed matter and materials physics