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Spin-polarized currents generated by magnetic Fe atomic chains

机译：磁性铁原子链产生的自旋极化电流

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摘要

Fe-based devices are widely used in spintronics because of high spin-polarization and magnetism. In this work, freestanding Fe atomic chains, the thinnest wires, were used to generate spin-polarized currents due to the spin-polarized energy bands. By ab initio calculations, the zigzag structure was found to be more stable than the wide-angle zigzag structure and had a higher ratio of spin-up and spin-down currents. By our theoretical prediction, Fe atomic chains have a sufficiently long thermal lifetime only at T?150 K, while C atomic chains are very stable even at T = 1000 K. This means that the spintronic devices based on Fe chains could work only at low temperatures. A system constructed by a short Fe chain sandwiched between two graphene electrodes could be used as a spin-polarized current generator, while a C chain could not be used in this way. The present work may be instructive and meaningful to further practical applications based on recent technical developments on the preparation of metal atomic chains (Proc. Natl. Acad. Sci. USA 107 9055 (2010)).
机译：由于高自旋极化和磁性，铁基器件广泛用于自旋电子学中。在这项工作中，由于自旋极化的能带，最细的电线即独立的Fe原子链被用于产生自旋极化的电流。通过从头算计算，发现之字形结构比广角之字形结构更稳定，并且具有更高的自旋向上和向下旋转电流比。根据我们的理论预测，Fe原子链仅在T？150 K时才具有足够长的热寿命，而C原子链甚至在T = 1000 K时也非常稳定。这意味着基于Fe链的自旋电子器件只能在较低的温度下工作温度。由夹在两个石墨烯电极之间的短铁链构成的系统可以用作自旋极化电流发生器，而不能以这种方式使用C链。基于关于金属原子链的制备的最新技术发展，当前的工作对于进一步的实际应用可能是有指导意义的并且有意义（Proc.Natl.Acad.Sci.USA 107 9055（2010））。

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