Towards molecular spintronics
Towards molecular spintronics
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DOI：
10.1038/nmat1349
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发表时间：
2005-04-01
期刊：
影响因子：
41.2
通讯作者：
Sanvito, S
中科院分区：
文献类型：
--
作者：
Rocha, AR;García-Suárez, VM;Sanvito, S
从基础和技术的角度来看，操纵有机分子材料中电子自旋的能力为自旋电子学提供了一条新的、极其诱人的途径。这主要是由于有机分子中弱自旋轨道和超精细相互作用的无可争议的优势，这使得在比传统金属或半导体更长的时间和距离上保持自旋相干性成为可能。在这里，我们从理论上证明，通过将有机分子夹在磁性接触之间而获得的有机自旋阀可以表现出大的依赖于偏置的磁阻，并且这可以通过适当选择分子和锚定基团来设计。我们通过结合最先进的非平衡输运方法和密度泛函理论获得的结果表明，尽管效应的大小随分子的细节而变化，但在隧道效应和金属极限中都可以发现大磁阻。
The ability to manipulate electron spin in organic molecular materials offers a new and extremely tantalizing route towards spin electronics, both from fundamental and technological points of view. This is mainly due to the unquestionable advantage of weak spin-orbit and hyperfine interactions in organic molecules, which leads to the possibility of preserving spin-coherence over times and distances much longer than in conventional metals or semiconductors. Here we demonstrate theoretically that organic spin valves, obtained by sandwiching an organic molecule between magnetic contacts, can show a large bias-dependent magnetoresistance and that this can be engineered by an appropriate choice of molecules and anchoring groups. Our results, obtained through a combination of state-of-the-art non-equilibrium transport methods and density functional theory, show that although the magnitude of the effect varies with the details of the molecule, large magnetoresistance can be found both in the tunnelling and the metallic limit.