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arXiv 1902.01709cond-mat.supr-con
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非均匀磁化率磁约瑟夫森结中的夫琅和费花样

Fraunhofer patterns in magnetic Josephson junctions with non-uniform magnetic susceptibility

Bence Börcsök, Sachio Komori, Alexander Buzdin, Jason Robinson

摘要:

基于磁约瑟夫森结的超导存储器和逻辑的发展依赖于对结特性的理解,特别是临界电流对外部磁通量(即夫琅和费模式)的依赖性。随着具有各种形式的非均匀势垒磁性的约瑟夫森结的迅速发展,夫琅和费花样也越来越复杂。在本文中,我们建立了磁约瑟夫森结的夫琅和费图案模型,其中势垒磁化率是位置和外部磁场相关的。该模型预测的异常夫琅和费图案中的约瑟夫森临界电流的局部极小值可以是非零和非周期性的外部磁通量由于高磁化和退磁区域之间的干扰效应。

英文摘要:

The development of superconducting memory and logic based on magnetic Josephson junctions relies on an understanding of junction properties and, in particular, the dependence of critical current on external magnetic flux (i.e. Fraunhofer patterns). With the rapid development of Josephson junctions with various forms of inhomogeneous barrier magnetism, Fraunhofer patterns are increasingly complex. In this paper we model Fraunhofer patterns for magnetic Josephson junctions in which the barrier magnetic susceptibility is position- and external magnetic field dependent. The model predicts anomalous Fraunhofer patterns in which local minima in the Josephson critical current can be nonzero and non-periodic with external magnetic flux due to an interference effect between highly magnetised and demagnetised regions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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