Direct imaging of vortex pinning at artificial antidots with different geometries
Direct imaging of vortex pinning at artificial antidots with different geometries
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不同几何形状人工解点涡旋钉扎的直接成像
DOI：
10.1063/1.5114654
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发表时间：
2019
影响因子：
4
通讯作者：
Ge Jun-Yi
中科院分区：
文献类型：
--
作者：
Zhang An-Lei;Xue Cun;Ge Jun-Yi
在超导体中引入人工反点是提高超导性能的有效途径。然而，除了开创性的理论研究之外，关于反点可以捕获多少涡旋的基本问题仍然需要从实验的角度进一步澄清。本研究利用电子束光刻技术，在超导Pb薄膜上制备了不同尺寸和形状的反点。利用低温扫描霍尔探针显微镜直接成像了反点处的涡旋分布。发现了一个普遍的尺度行为，即捕获漩涡的数量主要取决于对点的大小，而与对点的形状无关。研究结果为人工钉钉中心涡钉钉的研究提供了新的思路，对实际应用具有重要意义。在超导体中引入人工反点是提高超导性能的有效途径。然而，除了开创性的理论研究之外，关于反点可以捕获多少涡旋的基本问题仍然需要从实验的角度进一步澄清。本研究利用电子束光刻技术，在超导Pb薄膜上制备了不同尺寸和形状的反点。利用低温扫描霍尔探针显微镜直接成像了反点处的涡旋分布。发现了一个普遍的尺度行为，即捕获漩涡的数量主要取决于对点的大小，而与对点的形状无关。研究结果为人工钉钉中心涡钉钉的研究提供了新的思路，对实际应用具有重要意义。
Introducing artificial antidots into superconductors is an efficient way to improve the superconducting properties for application. However, besides the pioneering theoretical studies, the fundamental question concerning how many vortices can be trapped by the antidot still needs to be further clarified from an experimental point of view. In this study, by the e-beam lithography, antidots with different sizes and shapes are fabricated in a superconducting Pb film. The vortex distribution at antidots has been directly imaged using the low-temperature scanning Hall probe microscope. A universal scaling behavior is found that the number of trapped vortices mainly depends on the size of the antidots, irrespective of the shape of antidots. The results shed light on the study of vortex pinning at artificial pinning centers, which is important for practical applications.Introducing artificial antidots into superconductors is an efficient way to improve the superconducting properties for application. However, besides the pioneering theoretical studies, the fundamental question concerning how many vortices can be trapped by the antidot still needs to be further clarified from an experimental point of view. In this study, by the e-beam lithography, antidots with different sizes and shapes are fabricated in a superconducting Pb film. The vortex distribution at antidots has been directly imaged using the low-temperature scanning Hall probe microscope. A universal scaling behavior is found that the number of trapped vortices mainly depends on the size of the antidots, irrespective of the shape of antidots. The results shed light on the study of vortex pinning at artificial pinning centers, which is important for practical applications.