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首页> 外文期刊>Physical review >Imaging pinning and expulsion of individual superconducting vortices in amorphous MoSi thin films
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Imaging pinning and expulsion of individual superconducting vortices in amorphous MoSi thin films

机译：在无定形MOSI薄膜中的成像固定和驱逐单个超导涡旋

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摘要

We use a scanning nanometer-scale superconducting quantum interference device (SQUID) to image individual vortices in amorphous superconducting MoSi thin films. Spatially resolved measurements of the magnetic field generated by both vortices and Meissner screening satisfy the Pearl model for vortices in thin films and yield values for the Pearl length and bulk penetration depth at 4.2 K. Flux pinning is observed and quantified through measurements of vortex motion driven by both applied currents and thermal activation. The effects of pinning are also observed in metastable vortex configurations, which form as the applied magnetic field is reduced and magnetic flux is expelled from the film. Understanding and controlling vortex dynamics in amorphous thin films is crucial for optimizing devices such as superconducting nanowire single photon detectors (SNSPDs), the most efficient of which are made from MoSi, WSi, and MoGe.
机译：我们使用扫描纳米尺度超导量子干扰装置（鱿鱼）来在非晶超导MOSI薄膜中图像单独的涡旋。由涡流和Meissner筛选产生的磁场的空间分辨测量满足薄膜中涡流的珍珠模型，并通过测量涡流运动驱动，观察到磁珠长度和散装穿透深度的珍珠长度和散装渗透深度的珍珠模型。通过施加的电流和热激活。在亚稳态涡旋结构中也观察到钉扎的效果，其形式作为所施加的磁场减少，并且从膜中排出磁通量。无定形薄膜中的涡旋动力学对优化诸如超导纳米线单光子探测器（SNSPDS）的诸如优化的装置至关重要，这是由MOSI，WSI和MOGE制成的最有效的装置。

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  • 来源
    《Physical review》 |2019年第10期|104504.1-104504.9|共9页
  • 作者

    Ceccarelli L.; Vasyukov D.; Wyss M.; Romagnoli G.; Rossi N.; Moser L.; Poggio M.;

  • 作者单位

    Univ Basel Dept Phys CH-4056 Basel Switzerland;

    Univ Basel Dept Phys CH-4056 Basel Switzerland;

    Univ Basel Dept Phys CH-4056 Basel Switzerland|Univ Basel Swiss Nanosci Inst CH-4056 Basel Switzerland;

    Univ Basel Dept Phys CH-4056 Basel Switzerland;

    Univ Basel Dept Phys CH-4056 Basel Switzerland|Univ Basel Swiss Nanosci Inst CH-4056 Basel Switzerland;

    Univ Basel Dept Phys CH-4056 Basel Switzerland;

    Univ Basel Dept Phys CH-4056 Basel Switzerland|Univ Basel Swiss Nanosci Inst CH-4056 Basel Switzerland;

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