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首页> 外文期刊>Superconductor Science & Technology >Different approaches to generate matching effects using arrays in contact with superconducting films
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Different approaches to generate matching effects using arrays in contact with superconducting films

机译：使用与超导膜接触的阵列产生匹配效果的不同方法

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Superconducting films in contact with non-superconducting regular arrays can exhibit commensurability effects between the vortex lattice and the unit cell of the pinning array. These matching effects yield a slowdown of the vortex flow and the corresponding dissipation decrease. The superconducting samples are Nb films grown on Si substrates. We have studied these matching effects with the array on top, embedded or threading the Nb superconducting films and using different materials (Si, Cu, Ni, Py dots and dots fabricated with Co/Pd multilayers). These hybrids allow for studying the contribution of different pinning potentials to the matching effects. The main findings are: (i) Periodic roughness induced in the superconducting film is enough to generate resistivity minima; (ii) A minor effect is achieved by magnetic pinning from periodic magnetic field potentials obtained by dots with out of plane magnetization grown on top of the superconducting film, (iii) In the case of array of magnetic dots embedded in the films, vortex flow probes the magnetic state; i.e. magnetoresistance measurements detect the magnetic state of very small nanomagnets. In addition, we have studied the role played by the local order in the commensurability effects. This was attained using an array that mimics a smectic crystal. We have found that preserving the local order is crucial. If the local order is not retained the magnetoresistance minima vanish.
机译：与非超导常规阵列接触的超导膜可以在旋转晶格和钉扎阵列的单元电池之间表现出具有的可致畸性效应。这些匹配效果产生涡流流动的放缓和相应的耗散减少。超导样品是在Si衬底上生长的Nb膜。我们已经用顶部的阵列进行了这些匹配效果，嵌入或穿过Nb超导膜并使用不同的材料（Si，Cu，Ni，Py点和用Co / Pd Multidayers制造的点）。这些混合动力车允许研究不同循环电位对匹配效果的贡献。主要发现是：（i）在超导膜中诱导的周期性粗糙度足以产生电阻率最小值; （ii）通过在通过在超导膜的顶部（III）的磁点阵列的磁点阵列的磁性点阵列的磁点阵列中，通过从超导膜的顶部生长的平面磁化而获得的周期性磁场电位来实现微小效果。探测磁状态;即磁阻测量检测非常小的纳米Magnet的磁状态。此外，我们研究了本地顺序在符号效应中扮演的作用。这是使用模拟近晶晶体的阵列获得的。我们发现保留本地订单至关重要。如果本地订单不保留磁阻最小值。

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