Vortex ordering and dynamics on Santa Fe artificial ice pinning arrays
Vortex ordering and dynamics on Santa Fe artificial ice pinning arrays
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DOI：
10.1063/5.0045584
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发表时间：
2021-01
影响因子：
4
通讯作者：
Wenzhao Li;C. Reichhardt;B. Jankó;C. Reichhardt
中科院分区：
文献类型：
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作者：
Wenzhao Li;C. Reichhardt;B. Jankó;C. Reichhardt
我们数值研究了超导涡旋与圣达菲人工冰钉扎阵列相互作用的有序性、钉扎性和流动性。我们发现，作为磁场和钉扎密度的函数，出现了各种各样的涡旋态，包括冰规则遵守状态和自旋模式。相反，正方形钉扎阵列，我们发现没有尖锐的峰值，由于固有的挫折效应所施加的圣达菲冰的几何形状的临界电流，然而，有一些平滑的峰值时，涡的数量匹配钉扎网站的数量。对于某些填料，圣达菲阵列表现出更强的钉扎比正方形阵列由于抑制一维流动通道时，圣达菲晶格中的涡流运动发生通过形成纵向和横向流动通道。
We numerically examine the ordering, pinning and flow of superconducting vortices interacting with a Santa Fe artificial ice pinning array. We find that as a function of magnetic field and pinning density, a wide variety of vortex states occur, including ice rule obeying states and labyrinthine patterns. In contrast to square pinning arrays, we find no sharp peaks in the critical current due to the inherent frustration effect imposed by the Santa Fe ice geometry; however, there are some smoothed peaks when the number of vortices matches the number of pinning sites. For some fillings, the Santa Fe array exhibits stronger pinning than the square array due to the suppression of one-dimensional flow channels when the vortex motion in the Santa Fe lattice occurs through the formation of both longitudinal and transverse flow channels.