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Vortex pinning vs superconducting wire network: origin of periodic oscillations induced by applied magnetic fields in superconducting films with arrays of nanomagnets

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Gómez, A. and Valle Granda, Javier del and González Herrera, Elvira María and Chiliotte, C. E. and Carreira, S. J. and Bekeris, V. and Prieto, J. L. and Schuller, Ivan K. and Vicent López, José Luis (2014) Vortex pinning vs superconducting wire network: origin of periodic oscillations induced by applied magnetic fields in superconducting films with arrays of nanomagnets. Superconductor science & technology, 27 (2014). ISSN 0953-2048

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Official URL: http://dx.doi.org/10.1088/0953-2048/27/6/065017


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Abstract

Hybrid magnetic arrays embedded in superconducting films are ideal systems to study the competition between different physical (such as the coherence length) and structural length scales such as are available in artificially produced structures. This interplay leads to oscillation in many magnetically dependent superconducting properties such as the critical currents, resistivity and magnetization. These effects are generally analyzed using two distinct models based on vortex pinning or wire network. In this work, we show that for magnetic dot arrays, as opposed to antidot (i.e. holes) arrays, vortex pinning is the main mechanism for field induced oscillations in resistance R(H), critical current I-c(H), magnetization M(H) and ac-susceptibility chi(ac)(H) in a broad temperature range. Due to the coherence length divergence at T-c, a crossover to wire network behaviour is experimentally found. While pinning occurs in a wide temperature range up to T-c, wire network behaviour is only present in a very narrow temperature window close to T-c. In this temperature interval, contributions from both mechanisms are operational but can be experimentally distinguished.


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© 2014 IOP Publishing Ltd.
We thank the support from Spanish MINECO grants FIS2008-06249 (Grupo Consolidado), Consolider CSD2007-00010 and CAM grant S2009/MAT-1726. The magnetism aspects of this work were supported by the Office of Basic Energy Science, U.S. Department of Energy, under Grant No. DE FG03-87ER-45332 and Argentina UBACyT 661 and PICT 2008 No 753.

Uncontrolled Keywords:Weak links; Thin-films; Transition; Temperature; Lattices; Size; Dots
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:42898
Deposited On:01 Jun 2017 18:28
Last Modified:08 Feb 2018 16:10

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