Large Conductance Switching in a Single-Molecule Device through Room Temperature Spin-Dependent Transport
Large Conductance Switching in a Single-Molecule Device through Room Temperature Spin-Dependent Transport
复制标题
DOI：
10.1021/acs.nanolett.5b03571
复制
发表时间：
2016-01-01
期刊：
影响因子：
10.8
通讯作者：
Diez-Perez, Ismael
中科院分区：
文献类型：
--
作者：
Aragones, Albert C.;Aravena, Daniel;Diez-Perez, Ismael
在纳米电子器件中控制电子的自旋是开发具有快速和高密度信息存储能力的器件的最有前途的课题之一。由磁性分子与金属表面相互作用产生的界面磁性或界面反之亦然，已成为创造具有新功能的纳米级分子器件的关键因素。在这里，我们提出了一种单分子导线，通过控制环境条件(液室中的室温)下的自旋相关输运，显示出大的(>；10000%)电导开关。分子线是通过在有机液体介质中捕获一个金电极和一个铁磁镍电极之间的单个自旋交叉的Fe-II络合物而建立的。当电子从金电极流向α向上或β向下自旋极化的镍电极时，测得单分子电导的巨大变化(>；100倍)。我们的计算表明，流过这种界面的电流似乎是强烈的自旋极化，从而导致了观察到的单分子导线电导的开关。在单分子导线中观察到如此高的自旋相关电导开关，为设计和控制室温下纳米分子器件中的自旋极化输运开辟了一扇新的大门。
Controlling the spin of electrons in nanoscale electronic devices is one of the most promising topics aiming at developing devices with rapid and high density information storage capabilities. The interface magnetism or spinterface resulting from the interaction between a magnetic molecule and a metal surface, or vice versa, has become a key ingredient in creating nanoscale molecular devices with novel functionalities. Here, we present a single-molecule wire that displays large (>10000%) conductance switching by controlling the spin-dependent transport under ambient conditions (room temperature in a liquid cell). The molecular wire is built by trapping individual spin crossover Fe-II complexes between one Au electrode and one ferromagnetic Ni electrode in an organic liquid medium. Large changes in the single-molecule conductance (>100-fold) are measured when the electrons flow from the Au electrode to either an alpha-up or a beta-down spin-polarized Ni electrode. Our calculations show that the current flowing through such an interface appears to be strongly spin-polarized, thus resulting in the observed switching of the single-molecule wire conductance. The observation of such a high spin-dependent conductance switching in a single-molecule wire opens up a new door for the design and control of spin-polarized transport in nanoscale molecular devices at room temperature.