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Electronic and magnetic properties of the interface between metal-quinoline molecules and cobalt

机译:金属喹啉分子与钴之间界面的电子和磁性

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摘要

It was recently established that spin injection from a ferromagnetic metal into an organic semiconductor depends largely on the formation of hybrid interface states. Here we investigate whether the magnetic properties of the interface between cobalt and tris(8-hydroxyquinolinato)-Al(Ⅲ) (Alq_3), the most prominent molecular candidate for organic spin-valve devices, can be modified by substituting the aluminum atom with either gallium or indium. The electronic structure of Alq_3, Gaq_3, and Inq_3 and the properties of their interfaces with ferromagnetic cobalt are probed experimentally, by using different photoemission spectroscopy methods, and theoretically, through density functional theory calculations. For all cases, the results highlight the presence of spin-polarized interface states. However no striking difference between the properties of the various molecules and interfaces is observed. This is a consequence of the fact that the molecules frontier orbitals are mainly localized on the ligands and they show only a negligible contribution coming from the metal ion.
机译:最近确定,从铁磁金属到有机半导体的自旋注入在很大程度上取决于杂化界面态的形成。在这里我们研究是否可以通过用铝原子取代铝原子来修饰钴和三(8-羟基喹啉基)-铝(Ⅲ)(Alq_3)(有机旋转阀装置最突出的分子候选物)之间的界面的磁性。镓或铟。 Alq_3,Gaq_3和Inq_3的电子结构及其与铁磁钴的界面性质通过使用不同的光发射光谱法进行了实验研究,并在理论上通过密度泛函理论计算进行了探讨。对于所有情况,结果突出显示了自旋极化界面状态的存在。然而,没有观察到各种分子和界面的性质之间的显着差异。这是由于以下事实的结果:分子前沿轨道主要位于配体上,并且它们仅显示出可忽略不计的来自金属离子的贡献。

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  • 来源
    《Physical review》 |2014年第9期|094412.1-094412.10|共10页
  • 作者单位

    School of Physics, AMBER and CRANN Institute, Trinity College, Dublin 2, Ireland;

    Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schroedinger Strasse 46, 67663 Kaiserslautern, Germany;

    Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schroedinger Strasse 46, 67663 Kaiserslautern, Germany;

    Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schroedinger Strasse 46, 67663 Kaiserslautern, Germany;

    Materials Research Institute and School of Physics and Astronomy, Queen Mary University of London, Mile End Road, E1 4NS London, United Kingdom;

    College of Physical Science and Technology, Sichuan University, Chengdu 610064, People's Republic of China;

    Materials Research Institute and School of Physics and Astronomy, Queen Mary University of London, Mile End Road, E1 4NS London, United Kingdom,College of Physical Science and Technology, Sichuan University, Chengdu 610064, People's Republic of China;

    Materials Research Institute and School of Physics and Astronomy, Queen Mary University of London, Mile End Road, E1 4NS London, United Kingdom;

    Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schroedinger Strasse 46, 67663 Kaiserslautern, Germany;

    School of Physics, AMBER and CRANN Institute, Trinity College, Dublin 2, Ireland;

    Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schroedinger Strasse 46, 67663 Kaiserslautern, Germany;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    spin transport through interfaces; polymers and organic compounds; polymers; organic compounds; adsorbed layers and thin films;

    机译:通过接口旋转传输;聚合物和有机化合物;聚合物有机化合物;吸附层和薄膜;

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