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Metal–Organic Hybrid Interface States of A Ferromagnet/Organic Semiconductor Hybrid Junction as Basis For Engineering Spin Injection in Organic Spintronics

Authors

  • Stefan Lach,

    Corresponding author
    1. Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schrödinger-Straße 56, D-67663 Kaiserslautern, Germany
    • Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schrödinger-Straße 56, D-67663 Kaiserslautern, Germany.
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  • Anna Altenhof,

    1. Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schrödinger-Straße 56, D-67663 Kaiserslautern, Germany
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  • Kartick Tarafder,

    1. Department of Physics and Astronomy, Uppsala University, Box 516, S-75120 Uppsala, Sweden
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  • Felix Schmitt,

    1. Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schrödinger-Straße 56, D-67663 Kaiserslautern, Germany
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  • Md. Ehesan Ali,

    1. Department of Physics and Astronomy, Uppsala University, Box 516, S-75120 Uppsala, Sweden
    2. Center for Theoretical Chemistry, Ruhr-University Bochum, D-44801 Bochum, Germany
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  • Michael Vogel,

    1. Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schrödinger-Straße 56, D-67663 Kaiserslautern, Germany
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  • Jens Sauther,

    1. Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schrödinger-Straße 56, D-67663 Kaiserslautern, Germany
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  • Peter M. Oppeneer,

    1. Department of Physics and Astronomy, Uppsala University, Box 516, S-75120 Uppsala, Sweden
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  • Christiane Ziegler

    1. Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schrödinger-Straße 56, D-67663 Kaiserslautern, Germany
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Abstract

Electrons in organic semiconductors (OSC) possess remarkably long spin relaxation times. Hybrid spintronic devices that combine OSC with ferromagnetic (FM) substrates are therefore expected to provide a route to devices with improved and new functionalities. A crucial role is played by the FM-OSC interface which governs the spin injection into the OSC. Using spin-resolved photoelectron spectroscopy and ab initio calculations we study here such possible injection channels in metal phthalocyanines (MPc). We report the first direct observation of the successful engineering of different spin-selective hybrid interface states at the Fermi level of a FM-OSC hybrid junction only by changing the central metal atom of a MPc. Our results demonstrate that tailoring the chemical interaction at the FM-OSC interface is a promising way to modify the spin injection channels and thus the spin injection capability.

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