Realization of Spin-dependent Functionality by Covering a Metal Surface with a Single Layer of Molecules
Realization of Spin-dependent Functionality by Covering a Metal Surface with a Single Layer of Molecules
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DOI：
10.1021/acs.nanolett.9b02619
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发表时间：
2019-10-01
期刊：
影响因子：
10.8
通讯作者：
Otani, Y.
中科院分区：
文献类型：
--
作者：
Isshiki, H.;Kondou, K.;Otani, Y.
分子与金属的界面由于其高度的设计自由度而在纳米电子学的研究领域中引起了广泛的关注。在这里，我们展示了一个有效的自旋到电荷电流转换在金属表面覆盖的单层分子。通过自旋泵方法将自旋电流注入金属（Cu）和酞菁铅（II）之间的界面。观测到的电压信号是由逆埃德尔斯坦效应引起的，即，界面处的自旋-电荷电流转换。的转换系数，逆埃德尔斯坦长度，估计为0.40 +/- 0.06 nm，可与最大的Rashba自旋分裂的界面与重金属。有趣的是，埃德尔斯坦长度强烈地依赖于分子的厚度，并采取一个最大值时，单层的分子在Cu表面上形成。扫描探针显微镜和第一性原理计算的对比分析表明，Rashba自旋分裂界面态的形成导致了逆埃德尔斯坦效应，其大小与分子的吸附构型有关.
An interface of molecule and metal has attracted much attention in the research field of nano-electronics because of their high degree of design freedom. Here, we demonstrate an efficient spin-to-charge current conversion at the metal surface covered by a single layer of molecules. Spin currents are injected into an interface between metal (Cu) and lead(II) phthalocyanine by means of the spin pumping method. An observed voltage signal is caused by the inverse Edelstein effect, i.e., spin-to-charge current conversion at the interface. The conversion coefficient, inverse Edelstein length, is estimated to be 0.40 +/- 0.06 nm, comparable with the largest Rashba spin splitting of interfaces with heavy metals. Interestingly, the Edelstein length strongly depends on the thickness of the molecule and takes a maximum value when a single layer of molecules is formed on the Cu surface. Comparative analysis between scanning probe microscopy and first-principles calculations reveal that the formation of interface state with Rashba spin splitting causes the inverse Edelstein effect, whose magnitude is sensitive to the adsorption configuration of the molecules.