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首页> 外文期刊>IEEE Transactions on Magnetics >Electrical Transport Study of Patterned Lateral Niobium-Permalloy Junctions
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Electrical Transport Study of Patterned Lateral Niobium-Permalloy Junctions

机译：图案化的横向铌-坡莫合金结的电输运研究

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摘要

In order to investigate the interplay between magnetic domain walls and superconductivity we study the electrical transport property of lateral Nb-permalloy-Nb junctions where the permalloy thickness is varied from 50 to 90 nm. Magnetic force microscopy images confirm the presence of domain walls in the ferromagnetic portion between the two superconducting electrodes for samples with permalloy thickness of 60, 70 and 90 nm. Below superconducting transition temperature, the zero bias conductance (ZBC) for these samples shows a sharp reduction in the magnetic field range of 0 to 0.15 T and after that it stays almost at a constant level until a high field is applied. The phenomenon is attributed to domain wall assisted crossed Andreev reflection (CAR) and/or long range triplet component (LRTC) of superconductivity. On the contrary, the decreasing trend of ZBC at low field is absent for the sample with 50 nm thick NiFe which indicates that the conductance contribution from CAR and/or LRTC is absent in this sample. This is presumably due the fact that the permalloy in the gap region for this sample is in a single domain state. A quantitative analysis for conductance contribution from domain wall assisted CAR is provided.
机译：为了研究磁畴壁和超导之间的相互作用，我们研究了坡莫合金厚度在50至90 nm之间变化的Nb-坡莫合金-Nb侧向结的电传输特性。磁力显微镜图像确认了坡莫合金厚度为60、70和90 nm的样品在两个超导电极之间的铁磁部分中存在畴壁。在超导转变温度以下，这些样品的零偏压电导（ZBC）在0至0.15 T的磁场范围内会急剧减小，此后几乎保持恒定水平，直到施加高磁场为止。该现象归因于畴壁辅助的十字交叉安德列夫反射（CAR）和/或超导的远距离三重态分量（LRTC）。相反，对于具有50 nm厚NiFe的样品，在低电场下ZBC不会降低，这表明该样品中没有CAR和/或LRTC的电导作用。据推测这是由于该样品的间隙区域中的坡莫合金处于单畴状态这一事实。提供了对畴壁辅助CAR的电导贡献的定量分析。

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