Department of Chemical Physics, Weizmann Institute of Science, Rehovot 76100, Israel.
Nano Lett. 2011 Nov 9;11(11):4652-5. doi: 10.1021/nl2021637. Epub 2011 Oct 13.
Spin-based properties, applications, and devices are commonly related to magnetic effects and to magnetic materials. Most of the development in spintronics is currently based on inorganic materials. Despite the fact that the magnetoresistance effect has been observed in organic materials, until now spin selectivity of organic based spintronics devices originated from an inorganic ferromagnetic electrode and was not determined by the organic molecules themselves. Here we show that conduction through double-stranded DNA oligomers is spin selective, demonstrating a true organic spin filter. The selectivity exceeds that of any known system at room temperature. The spin dependent resistivity indicates that the effect cannot result solely from the atomic spin-orbit coupling and must relate to a special property resulting from the chirality symmetry. The results may reflect on the importance of spin in determining electron transfer rates through biological systems.
基于自旋的性质、应用和器件通常与磁效应和磁性材料有关。自旋电子学的大部分发展目前都基于无机材料。尽管在有机材料中已经观察到磁电阻效应，但到目前为止，基于有机的自旋电子学器件的自旋选择性源自无机铁磁电极，而不是由有机分子本身决定。在这里，我们证明了通过双链 DNA 寡聚物的传导是自旋选择性的，展示了真正的有机自旋滤波器。这种选择性超过了目前在室温下已知的任何系统。自旋相关电阻率表明，这种效应不可能仅仅来自原子的自旋轨道耦合，而必须与手性对称性产生的特殊性质有关。研究结果可能反映了自旋在决定电子通过生物系统的转移速率方面的重要性。
