Spin injection and detection in magnetic nanostructures
Spin injection and detection in magnetic nanostructures
复制标题
磁性纳米结构中的自旋注入和探测
DOI：
10.1103/physrevb.67.052409
复制
发表时间：
2003-02-01
影响因子：
3.7
通讯作者：
Maekawa, S
中科院分区：
文献类型：
--
作者：
Takahashi, S;Maekawa, S
本文从理论上研究了与铁磁注入电极和检测电极相连的金属中的自旋输运。我们推导出了自旋积累信号的一般表达式，它涵盖了从金属到隧穿的制度。这使我们能够讨论最近的争议自旋注入和检测实验。将结果推广到超导器件，我们发现，自旋积累信号的超导间隙的开放强烈增强，因为带隙的超导体是一个低载流子系统的自旋输运，但不是电荷。在半导体器件中也预期这种增强。
We study theoretically the spin transport in a nonmagnetic metal connected to ferromagnetic injector and detector electrodes. We derive a general expression for the spin accumulation signal which covers from the metallic to the tunneling regime. This enables us to discuss recent controversy on spin injection and detection experiments. Extending the result to a superconducting device, we find that the spin accumulation signal is strongly enhanced by opening of the superconducting gap since a gapped superconductor is a low carrier system for spin transport but not for charge. The enhancement is also expected in semiconductor devices.