Spin transport across the interface in ferromagnetic/nonmagnetic systems
Spin transport across the interface in ferromagnetic/nonmagnetic systems
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DOI：
10.1103/physrevb.99.064406
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发表时间：
2019-02
影响因子：
3.7
通讯作者：
C. Swindells;A. Hindmarch;A. Gallant;D. Atkinson
中科院分区：
文献类型：
--
作者：
C. Swindells;A. Hindmarch;A. Gallant;D. Atkinson
了解界面自旋输运是开发磁电子器件的关键，然而，所涉及的参数的确切性质尚不清楚。在这里，我们对铁磁层（Co、CoFeB）和重金属层（Pt、Ru）的各种结构进行了详细的基于铁磁共振的自旋输运分析，以充分量化界面自旋输运参数。对于更紧密匹配的铁磁体和重金属晶体结构，观察到增强的自旋混合电导，并且重要的是，包含厚度依赖的自旋扩散长度给出了Pt的9.4 ± 0.7 nm的体值，解决了报告的差异。
Understanding interfacial spin transport is key to developing magnetoelectonic devices, however, the exact nature of the parameters involved is unclear. Here, we report a detailed ferromagnetic resonance-based spintransport analysis on a variety of structures of both ferromagnetic (Co, CoFeB) and heavy metal layers (Pt, Ru) in order to fully quantify the interfacial spin-transport parameters. Enhanced spin-mixing conductance is observed for more closely matched ferromagnet and heavy metal crystal structures, and, significantly, the inclusion of a thickness-dependent spin-diffusion length gives a bulk value of 9.4 ± 0.7 nm for Pt, resolving reported discrepancies.