铁磁-超导-铁磁异质结中自旋和电荷输运：Stoner与自旋质量失配机制
Spin and charge transport in ferromagnet-superconductor-ferromagnet heterostructures: Stoner versus spin mass mismatch mechanism
摘要：
我们研究通过弹道铁磁超导铁磁（F/S/F）结的运输现象，比较的情况下，在两个F层的铁磁顺序是标准的斯通纳型的情况下，它是由自旋质量失配（SMM）驱动。结果表明，这两种机制导致的电荷和自旋电导的不同的行为，特别是当相比于相应的非超导铁磁体正常铁磁体（F/N/F）结。特别地，当注入电流垂直于势垒时，对于高势垒透明度和F层的大磁化，大的质量失配引起F/S/F结的低偏置电荷和自旋电导的增强，这在等质量情况下没有观察到。当考虑所有允许的注入方向时，对于高势垒透明度和F层的大磁化，SMM引线的电荷电导的低偏压增强仍然成立。然而，在非透明界面的情况下，与SMM铁磁体的自旋输运表现出相反的符号响应相对于斯通纳的情况下，在高偏置的所有磁化值，也表现出显着的放大在间隙边缘处的超导性引起的。上述差异可以用来探测在给定材料中建立铁磁有序的电子机制的性质。
英文摘要：
We study transport phenomena through a ballistic ferromagnet-superconductor-ferromagnet (F/S/F) junction, comparing the case in which the ferromagnetic order in the two F layers is of the standard Stoner type with the case where it is driven by a spin mass mismatch (SMM). It is shown that the two mechanisms lead to a different behavior in the charge and the spin conductances, especially when compared to the corresponding non-superconducting ferromagnet-normal-ferromagnet (F/N/F) junctions. In particular, when the injected current is perpendicular to the barrier, for high barrier transparency and large magnetization of the F layers, the large mass mismatch gives rise to an enhancement of both low-bias charge and spin conductances of the F/S/F junction, which is not observed in the equal-mass case. When all the allowed injection directions are considered, the low bias enhancement of the charge conductance for SMM leads still holds for high barrier transparency and large magnetization of the F layers. However, in the case of non-transparent interfaces, spin transport with SMM ferromagnets exhibits an opposite sign response with respect to the Stoner case at high biases for all magnetization values, also manifesting a significant amplification induced by superconductivity at the gap edge. The above mentioned differences can be exploited to probe the nature of the electronic mechanism underlying the establishment of the ferromagnetic order in a given material.
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。
