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Controllable morphology of flux avalanches in microstructured superconductors

机译：微结构超导体中磁通雪崩的可控形态

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摘要

The morphology of abrupt bursts of magnetic flux into superconducting films with engineered periodic pinning centers (antidots) has been investigated. Guided flux avalanches of thermomagnetic origin develop a treelike structure, with the main trunk perpendicular to the borders of the sample, while secondary branches follow well-defined directions determined by the geometrical details of the underlying periodic pinning landscape. Strikingly, we demonstrate that in a superconductor with relatively weak random pinning the morphology of such flux avalanches can be fully controlled by proper combinations of lattice symmetry and antidot geometry. Moreover, the resulting flux patterns can be reproduced, to the finest details, by simulations based on a phenomenological thermomagnetic model. In turn, this model can be used to predict such complex structures and to estimate physical variables of more difficult experimental access, such as the local values of temperature and electric field.
机译：研究了具有工程化的周期性钉扎中心（解毒剂）的超导薄膜中突然出现的磁通爆发的形态。热磁起源的引导通量雪崩形成树状结构，主干垂直于样品的边界，而次要分支遵循定义良好的方向，该方向由下面的周期性钉扎景观的几何细节确定。惊人地，我们证明了在具有相对弱的随机钉扎的超导体中，这种通量雪崩的形态可以通过晶格对称性和解毒剂几何形状的适当组合来完全控制。此外，通过基于现象学热磁模型的模拟，可以最精确地再现所得的磁通量模式。反过来，该模型可用于预测这种复杂的结构，并估算较难实验的物理变量，例如温度和电场的局部值。

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  • 来源
    《Physical review》 |2014年第13期|134508.1-134508.7|共7页
  • 作者

    M. Motta; F. Colauto; J. I. Vestgarden; J. Fritzsche; M. Timmermans; J. Cuppens; C. Attanasio; C. Cirillo; V. V. Moshchalkov; J. Van de Vondel; T. H. Johansen; W. A. Ortiz; A. V. Silhanek;

  • 作者单位

    Departamento de Fisica, Universidade Federal de Sao Carlos, 13565-905 Sao Carlos, Sao Paulo, Brazil;

    Departamento de Fisica, Universidade Federal de Sao Carlos, 13565-905 Sao Carlos, Sao Paulo, Brazil;

    Department of Physics, University of Oslo, POB 1048, Blindern, 0316 Oslo, Norway;

    Department of Applied Physics, Chalmers University of Technology, S-412 96 Goeteborg, Sweden;

    Institute for Nanoscale Physics and Chemistry, Nanoscale Superconductivity and Magnetism Group, Katholieke Universiteit Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium;

    Institute for Nanoscale Physics and Chemistry, Nanoscale Superconductivity and Magnetism Group, Katholieke Universiteit Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium;

    CNR-SPIN Salerno and Dipartimento di Fisica 'E. R. Caianiello', Universita degli Studi di Salerno, Fisciano (Sa) I-84084, Italy;

    CNR-SPIN Salerno and Dipartimento di Fisica 'E. R. Caianiello', Universita degli Studi di Salerno, Fisciano (Sa) I-84084, Italy;

    Institute for Nanoscale Physics and Chemistry, Nanoscale Superconductivity and Magnetism Group, Katholieke Universiteit Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium;

    Institute for Nanoscale Physics and Chemistry, Nanoscale Superconductivity and Magnetism Group, Katholieke Universiteit Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium;

    Department of Physics, University of Oslo, POB 1048, Blindern, 0316 Oslo, Norway,Institute for Superconducting and Electronic Materials, University of Wollongong, Northfields Avenue, Wollongong, New South Wales 2522, Australia;

    Departamento de Fisica, Universidade Federal de Sao Carlos, 13565-905 Sao Carlos, Sao Paulo, Brazil;

    Departement de Physique, Universite de Liege, B-4000 Sart Tilman, Belgium;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    magnetic properties; thermal stability; thermal effects; superconducting films and low-dimensional structures;

    机译：磁性热稳定性;热效应;超导膜和低维结构;

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