Field modulation of the critical current in magnetic Josephson junctions
Field modulation of the critical current in magnetic Josephson junctions
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DOI：
10.1088/0953-2048/26/5/055017
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发表时间：
2013-05-01
影响因子：
3.6
通讯作者：
Robinson, J. W. A.
中科院分区：
文献类型：
--
作者：
Blamire, M. G.;Smiet, C. B.;Robinson, J. W. A.
简单约瑟夫森结的临界电流与外加磁场的关系是众所周知的，对于矩形结，在将通量量子引入结区的场上产生经典的具有周期零点的‘夫琅和费’调制。最近的许多工作都是在含有磁性层的约瑟夫森结上进行的。这种层的磁化会向结中引入额外的磁通，对于大结区或强磁性材料，会显著扭曲临界电流的调制，并强烈抑制最大临界电流。人们对在铁磁体中诱导奇频率三重态配对的结的兴趣与日俱增，而且需要与理论进行定量比较，这意味着有必要充分理解磁势垒在控制临界电流中的作用。本文分析了磁场和各种磁构型对约瑟夫森临界电流的影响；整体处理适用于一般形状的结，但考虑了正方形和矩形结的特殊情况。
The dependence of the critical current of a simple Josephson junction on the applied magnetic field is well known and, for a rectangular junction, gives rise to the classic 'Fraunhofer' modulation with periodic zeros at the fields that introduce a flux quantum into the junction region. Much recent work has been performed on Josephson junctions that contain magnetic layers. The magnetization of such layers introduces additional flux into the junction and, for large junction areas or strong magnetic materials, can significantly distort the modulation of the critical current and strongly suppress the maximum critical current. The growing interest in junctions that induce odd-frequency triplet pairing in a ferromagnet, and the need to make quantitative comparisons with theory, mean that a full understanding of the role of magnetic barriers in controlling the critical current is necessary. This paper analyses the effect of magnetism and various magnetic configurations on Josephson critical currents; the overall treatment applies to junctions of general shape, but the specific cases of square and rectangular junctions are considered.