Energy level alignment and interactive spin polarization at organic/ferromagnetic metal interfaces for organic spintronics |
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| Affiliation: | 1. Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden;2. State Key Laboratory of ASIC and System, Department of Microelectronics, SIST, Fudan University, Shanghai 200433, China;1. School of Atmospheric Physics, Nanjing University of Information Science & Technology, Nanjing 210044, PR China;2. Mississippi State University, Starkville, MS 39762, USA;3. Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, PR China;4. Department of Chemistry, University of Science and Technology of China, Hefei 230026, PR China;1. Center for Nano Science and Technology @PoliMi, Istituto Italiano di Tecnologia, Via Pascoli 70/3, 20133 Milan, Italy;2. Dipartimento di Fisica, Politecnico di Milano, P.zza L. da Vinci 32, 20133 Milan, Italy;1. Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 100083, China;2. Department of Physical Electronics, Tokyo Institute of Technology, 2-12-1 S3-33 O-okayama, Meguro-ku, Tokyo 152-8552, Japan |
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| Abstract: | Energy level alignment and spin polarization at tetracyanoquinodimethane/Fe and acridine orange base/Fe interfaces are investigated by means of photoelectron spectroscopy and X-ray magnetic circular dichroism (XMCD), respectively, to explore their potential application in organic spintronics. Interface dipoles are observed at both hybrid interfaces, and the work function of Fe is increased by 0.7 eV for the tetracyanoquinodimethane (TCNQ) case, while it is decreased by 1.2 eV for the acridine orange base (AOB) case. According to XMCD results, TCNQ molecule has little influence on the spin polarization of Fe surface. In contrast, AOB molecule reduces the interfacial spin polarization of Fe significantly. Induced spin polarization of the two organic molecules at the interfaces is not observed. The results reveal the necessity of investigating the magnetic property changes of both the OSC and the FM during the process of energy level alignment engineering. |
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| Keywords: | Organic spintronics Photoemission spectroscopy X-ray magnetic circular dichroism Spin polarization Organic-metal interface |
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