Critical current oscillations in strong ferromagnetic pi junctions.
Critical current oscillations in strong ferromagnetic pi junctions.
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DOI：
10.1103/physrevlett.97.177003
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发表时间：
2006-06
影响因子：
8.6
通讯作者：
Jason W. A. Robinson;Samanta Piano;Samanta Piano;G. Burnell;Christopher Bell;M. Blamire
中科院分区：
文献类型：
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作者：
Jason W. A. Robinson;Samanta Piano;Samanta Piano;G. Burnell;Christopher Bell;M. Blamire
我们报告的磁性和电气测量Nb约瑟夫森结的强铁磁势垒的Co，Ni，和Ni 80 Fe 20（Py）。所有这些材料都表现出临界电流的多重振荡，势垒厚度意味着超导序参量中的重复0-π相变。我们表明，特别是，可以准确地模拟使用现有的清洁极限理论的Co障碍设备，尽管交换能量高（309毫电子伏），在π态的大IcR（N）值意味着Co障碍是理想的超导π位移设备的实际发展。
We report magnetic and electrical measurements of Nb Josephson junctions with strongly ferromagnetic barriers of Co, Ni, and Ni80Fe20 (Py). All these materials show multiple oscillations of critical current with a barrier thickness implying repeated 0-pi phase transitions in the superconducting order parameter. We show, in particular, that the Co barrier devices can be accurately modeled using existing clean limit theories and that, despite the high exchange energy (309 meV), the large IcR(N) value in the pi state means Co barriers are ideally suited to the practical development of superconducting pi-shift devices.