Electromagnetic proximity effect controlled by spin-triplet correlations in superconducting spin-valve structures
Electromagnetic proximity effect controlled by spin-triplet correlations in superconducting spin-valve structures
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DOI：
10.1103/physrevb.99.104519
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发表时间：
2019-03-28
影响因子：
3.7
通讯作者：
Buzdin, A.
中科院分区：
文献类型：
--
作者：
Devizorova, Zh;Mironov, S., V;Buzdin, A.
在超导自旋阀结构中，由于磁矩的非共线织构的存在，自旋三重态的相关关系增强了电磁接近效应，即磁场从铁磁层(F)向超导层(S)的远程泄漏。在Usadel理论和Eilenberger理论的基础上分别研究了脏极限和干净极限。我们的研究结果为μ子自旋技术在广泛的层状S/F系统中观察到的由非共线磁结构引起的自发磁场的令人困惑的增强提供了一个自然的解释。我们证明了电磁接近效应导致临界电流对外部磁场的夫琅和费依赖的偏移，在一个超导电极被铁磁层覆盖的约瑟夫森结中。这为测量超导体中自发磁场的大小和方向提供了另一种方法。我们还证明了F-1/S/F-2结构中磁态的远程超导控制的可能性。
The spin-triplet correlations in superconducting spin valve structures arising in the presence of noncollinear textures of magnetic moment are shown to enhance strongly the electromagnetic proximity effect, i.e., the long-range leakage of the magnetic field from the ferromagnet (F) to the superconducting (S) layer. Both the dirty and clean limits are studied on the basis of the Usadel and Eilenberger theory, correspondingly. Our results suggest a natural explanation for the puzzling enhancement of the spontaneous magnetic fields induced by the noncollinear magnetic structures observed by the muon spin rotation techniques in a wide class of layered S/F systems. We show that the electromagnetic proximity effect causes the shift of the Fraunhofer dependence of the critical current on the external magnetic field in the Josephson junction with one superconducting electrode covered by the ferromagnetic layer. This provides an alternative way to measure both the magnitude and the direction of the spontaneous magnetic field induced in the superconductor. We also demonstrate the possibility of the long-ranged superconductivity control of the magnetic state in F-1/S/F-2 structures.