Imaging of magnetic vortices in superconducting networks and clusters by scanning SQUID microscopy
Imaging of magnetic vortices in superconducting networks and clusters by scanning SQUID microscopy
复制标题
通过扫描 SQUID 显微镜对超导网络和团簇中的磁涡流进行成像
DOI：
10.1063/1.110687
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发表时间：
1993
影响因子：
4
通讯作者：
D. Harlingen
中科院分区：
文献类型：
--
作者：
L. N. Vu;M. S. Wistrom;D. Harlingen
我们已经使用扫描SQUID显微镜（SSM）成像了二维超导体阵列和团簇中捕获的磁涡旋的配置。SSM在阵列表面上扫描dc SQUID探测器，在高达1 cm×1 cm的扫描范围内实现优于10 μm的空间分辨率，磁通灵敏度约为10−4Φ0。我们已经获得了在每个单元Φ的不同施加磁通量值下冷却的大型正方形阵列的图像。对于低有理数值（1/2，1/3，1/4，...）在阻挫参数f=Φ/Φ0的情况下，我们发现由畴壁分隔的周期性排列的涡旋区域;在场的其他值下，涡旋图案是无序的。我们还提出了3×3星系团系综中涡旋模式的观测结果。
We have imaged the configuration of trapped magnetic vortices in two‐dimensional superconductor arrays and clusters using a scanning SQUID microscope (SSM). The SSM scans a dc SQUID detector over the array surface, achieving better than 10 μm spatial resolution over a scan range up to 1 cm×1 cm and a magnetic flux sensitivity of about 10−4Φ0. We have obtained images of large square arrays cooled at different values of applied magnetic flux per cell Φ. For low rational values (1/2,1/3,1/4,...) of the frustration parameter f=Φ/Φ0, we find regions of periodically arranged vortices separated by domain walls; at other values of the field, the vortex pattern is disordered. We also present observations of vortex patterns in ensembles of 3×3 clusters.