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

Gómez Gutiérrez, Alicia and Valle Granda, Javier del and González, E. M. and Chiliotte, C. E. and Carreira, S. J. and Bekeris, V. and Prieto Martin, Jose Luis 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 and Technology", v. 27 (n. 6); pp. 1-6. ISSN 0953-2048. https://doi.org/10.1088/0953-2048/27/6/065017.

Description

Title: Vortex pinning vs superconducting wire network: origin of periodic oscillations induced by applied magnetic fields in superconducting films with arrays of nanomagnets
Author/s:
  • Gómez Gutiérrez, Alicia
  • Valle Granda, Javier del
  • González, E. M.
  • Chiliotte, C. E.
  • Carreira, S. J.
  • Bekeris, V.
  • Prieto Martin, Jose Luis
  • Schuller, Ivan K.
  • Vicent López, José Luis
Item Type: Article
Título de Revista/Publicación: Superconductor Science and Technology
Date: June 2014
ISSN: 0953-2048
Volume: 27
Subjects:
Freetext Keywords: Vortex pinning, nanoestructures, Little–Parks effect
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Electrónica Física
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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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 Ic(H), magnetization M(H) and ac-susceptibility χ ac(H) in a broad temperature range. Due to the coherence length divergence at Tc, a crossover to wire network behaviour is experimentally found. While pinning occurs in a wide temperature range up to Tc, wire network behaviour is only present in a very narrow temperature window close to Tc. In this temperature interval, contributions from both mechanisms are operational but can be experimentally distinguished.

More information

Item ID: 35907
DC Identifier: http://oa.upm.es/35907/
OAI Identifier: oai:oa.upm.es:35907
DOI: 10.1088/0953-2048/27/6/065017
Official URL: http://iopscience.iop.org/0953-2048/27/6/065017/
Deposited by: Memoria Investigacion
Deposited on: 27 Jun 2015 10:56
Last Modified: 27 Jun 2015 10:56
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