Dynamic spin filtering at the Co/Alq3 interface mediated by weakly coupled second layer molecules.
Dynamic spin filtering at the Co/Alq3 interface mediated by weakly coupled second layer molecules.
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DOI：
10.1038/ncomms12668
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发表时间：
2016-08-31
影响因子：
16.6
通讯作者：
Cinchetti, Mirko
中科院分区：
文献类型：
--
作者：
Droghetti, Andrea;Thielen, Philip;Rungger, Ivan;Haag, Norman;Grossmann, Nicolas;Stoeckl, Johannes;Stadtmueller, Benjamin;Aeschlimann, Martin;Sanvito, Stefano;Cinchetti, Mirko
在有机-金属界面处的自旋过滤通常由有机分子与用作电极的无机磁体之间的相互作用的细节决定。在这里，我们展示了一个自旋过滤机制的基础上形成的磁铁和弱物理吸附分子的长寿命界面态的动态自旋弛豫。我们调查的情况下，Alq 3的Co和，通过结合双光子光电子发射实验与电子结构理论，表明所观察到的长时间的自旋相关的电子动力学驱动的分子在第二有机层。物理吸附的分子形成的界面态不是自旋分裂的，而是获得自旋相关的寿命，这是与Co衬底相互作用驱动的动态自旋弛豫的结果。这种自旋过滤机制在自旋极化载流子穿过界面注入以及它们连续跳跃扩散到分子自旋电子器件的连续分子层中具有重要作用。 在有机分子层和金属磁性表面之间的混合界面处，可以利用自旋过滤效应来产生自旋极化。在这里，作者展示了一个动态的自旋过滤效应，通过第二Alq 3层介导的Co/Alq 3界面。
Spin filtering at organic-metal interfaces is often determined by the details of the interaction between the organic molecules and the inorganic magnets used as electrodes. Here we demonstrate a spin-filtering mechanism based on the dynamical spin relaxation of the long-living interface states formed by the magnet and weakly physisorbed molecules. We investigate the case of Alq3 on Co and, by combining two-photon photoemission experiments with electronic structure theory, show that the observed long-time spin-dependent electron dynamics is driven by molecules in the second organic layer. The interface states formed by physisorbed molecules are not spin-split, but acquire a spin-dependent lifetime, that is the result of dynamical spin-relaxation driven by the interaction with the Co substrate. Such spin-filtering mechanism has an important role in the injection of spin-polarized carriers across the interface and their successive hopping diffusion into successive molecular layers of molecular spintronics devices. At the hybrid interface between an organic molecular layer and a metallic magnetic surface, spin-filtering effects may be exploited for the generation of spin polarization. Here, the authors demonstrate a dynamic spin-filtering effect across the Co/Alq3 interface, mediated via a second Alq3 layer.
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影响因子：
3.7
作者：
Garcia-Lastra, J. M.;Rostgaard, C.;Thygesen, K. S.
通讯作者：
Thygesen, K. S.
影响因子：
3.7
作者：
Droghetti, Andrea;Steil, Sabine;Cinchetti, Mirko
通讯作者：
Cinchetti, Mirko
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作者：
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作者：
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通讯作者：
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