论文标题
SFIF的异常电流电压特征Josephson连接弱铁磁层
Anomalous current-voltage characteristics of SFIFS Josephson junctions with weak ferromagnetic interlayers
论文作者
论文摘要
我们介绍了SFIFS Josephson连接的电流 - 电压特性（CVC）（S表示散装超导体，F-金属铁磁铁，I-绝缘屏障），具有弱铁磁层的障碍物。该问题在非线性USADEL方程的框架中解决。我们考虑强大的隧道屏障的情况，使得左SF和右FS双层被解耦。我们使用自洽数值方法计算SF双层中的状态密度（DOS）。然后，我们获得了相应的SFIFS连接的CVC，并讨论了它们的特性，以了解不同参数集，包括铁磁层的厚度，交换场和磁散射时间。在弱铁磁层中，我们观察到异常的非单调CVC行为，如果F层中的小交换场，我们将其归因于DOS能量依赖性。
We present a quantitative study of the current-voltage characteristics (CVC) of SFIFS Josephson junctions (S denotes bulk superconductor, F - metallic ferromagnet, I - insulating barrier) with weak ferromagnetic interlayers in the diffusive limit. The problem is solved in the framework of the nonlinear Usadel equations. We consider the case of a strong tunnel barrier such that the left SF and the right FS bilayers are decoupled. We calculate the density of states (DOS) in SF bilayers using a self-consistent numerical method. Then we obtain the CVC of corresponding SFIFS junctions, and discuss their properties for different set of parameters including the thicknesses of ferromagnetic layers, the exchange field, and the magnetic scattering time. We observe the anomalous nonmonotonic CVC behavior in case of weak ferromagnetic interlayers, which we ascribe by DOS energy dependencies in case of small exchange fields in F layers.
