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Timing vortex confinement by magnetic domains in a superconductor/ferromagnet bilayer

机译:超导体/铁磁体双层中磁畴的定时涡旋约束

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摘要

We use a line of miniature Hall sensors to study the effect of magnetic-domain-induced vortex confinement on the flux dynamics in a superconductor/ferromagnet bilayer. A single tunable bilayer is built of a ferromagnetic Co/Pt multilayer with perpendicular magnetic anisotropy and a superconducting Nb layer, with the insulating layer in-between to avoid the proximity effect. The magnetic-domain patterns of various geometries are reversibly predefined in the Co/Pt multilayer using the appropriate magnetization procedure. The magnetic-domain geometry strongly affects vortex dynamics, leading to geometry-dependent trapping of vortices at the sample edge, nonuniform flux penetration, and strongly nonuniform critical current density. With the decreasing temperature, the magnetic pinning increases, but this increase is substantially weaker than that of the intrinsic pinning. The analysis of the initial flux penetration suggests that vortices may form various vortex structures, including disordered Abrikosov lattice or single and double vortex chains, in which minimal vortex-vortex distance is comparable to the magnetic penetration depth.
机译:我们使用一系列微型霍尔传感器来研究磁畴感应涡流限制对超导体/铁磁体双层中的通量动力学的影响。单个可调谐双层由具有垂直磁各向异性的铁磁Co / Pt多层和超导Nb层构成,绝缘层位于其间以避免邻近效应。使用适当的磁化程序可逆地在Co / Pt多层中预定义了各种几何形状的磁畴图案。磁畴的几何形状会强烈影响涡旋动力学,从而导致与几何形状有关的涡旋在样品边缘处陷获,通量渗透不均匀以及临界电流密度非常不均匀。随着温度的降低,磁性钉扎增加,但是这种增加远小于固有钉扎的增加。初始磁通穿透的分析表明,涡流可能形成各种涡旋结构,包括无序Abrikosov晶格或单涡旋链和双涡旋链,其中最小涡旋-涡旋距离与磁穿透深度相当。

著录项

  • 来源
    《Physical review》 |2013年第1期|014519.1-014519.13|共13页
  • 作者单位

    Institute of Physics, Polish Academy of Sciences, 02 668 Warsaw, Poland,Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218, USA;

    Institute of Physics, Polish Academy of Sciences, 02 668 Warsaw, Poland,Laboratoire des Solides Irradies, Ecole Polytechnique, 91128 Palaiseau, France;

    Laboratoire des Solides Irradies, Ecole Polytechnique, 91128 Palaiseau, France;

    Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218, USA;

    Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218, USA,Department of Physics, Bryn Mawr College, Bryn Mawr, Pennsylvania 19010-2899, USA;

    Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    magnetic properties; multilayers, superlattices, heterostructures;

    机译:磁性多层;超晶格;异质结构;

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