论文标题
亚铁磁性NICU中横向自旋电流的吸收：散装散发散射的优势
Absorption of Transverse Spin Current in Ferromagnetic NiCu: Dominance of Bulk Dephasing over Spin-Flip Scattering
论文作者
论文摘要
在铁磁金属中，横向自旋电流被认为是通过脱落来吸收的 - 即，旋转的破坏性干扰对强交换场进行预击。然而，由于典型的铁磁薄膜的超短连贯长度约为$ \ $ 1 nm，因此很难区分散装中的dephase dephase the bult the dephase the dephase the dephase the bult the dephase the dephase the the bumb。在这里，为了评估哪种机制占主导地位，我们检查了具有减少交换场的铁磁NICU合金膜中的横向自旋 - 流动吸收。我们观察到，一致性长度随着居里温度的降低而增加，因为在薄膜中较弱的倾向减慢了自旋吸收。此外，非磁性Cu杂质不会降低吸收自旋电流的自旋转移扭矩的效率。我们的发现肯定，即使具有高杂质含量，横向自旋电流主要是通过将纳米厚的铁磁金属倾斜来吸收的。
In ferromagnetic metals, transverse spin currents are thought to be absorbed via dephasing -- i.e., destructive interference of spins precessing about the strong exchange field. Yet, due to the ultrashort coherence length of $\approx$1 nm in typical ferromagnetic thin films, it is difficult to distinguish dephasing in the bulk from spin-flip scattering at the interface. Here, to assess which mechanism dominates, we examine transverse spin-current absorption in ferromagnetic NiCu alloy films with reduced exchange fields. We observe that the coherence length increases with decreasing Curie temperature, as weaker dephasing in the film bulk slows down spin absorption. Moreover, nonmagnetic Cu impurities do not diminish the efficiency of spin-transfer torque from the absorbed spin current. Our findings affirm that transverse spin current is predominantly absorbed by dephasing inside the nanometer-thick ferromagnetic metals, even with high impurity contents.
