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Energy level alignment and interactive spin polarization at organic/ferromagnetic metal interfaces for organic spintronics
Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. Linköping University, The Institute of Technology.ORCID iD: 0000-0001-6269-4691
Fudan University, Shanghai, China.
Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. Linköping University, The Institute of Technology.
2014 (English)In: Organic electronics, ISSN 1566-1199, E-ISSN 1878-5530, Vol. 15, no 9, 1951-1957 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Elsevier, 2014. Vol. 15, no 9, 1951-1957 p.
Keyword [en]
Organic spintronics; Photoemission spectroscopy; X-ray magnetic circular dichroism; Spin polarization; Organic-metal interface
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-108494DOI: 10.1016/j.orgel.2014.05.021ISI: 000340072200009OAI: oai:DiVA.org:liu-108494DiVA: diva2:730579
Projects
EU-project NMP3-SL-2011-263104-HINTSSwedish Research Council (VR) Grant 2011-7307
Funder
EU, FP7, Seventh Framework Programme, NMP3-SL-2011-263104-HINTSSwedish Research Council, Grant 2011-7307
Available from: 2014-06-28 Created: 2014-06-28 Last updated: 2017-12-05Bibliographically approved

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