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Hybrid Interface States and Spin Polarization at Ferromagnetic Metal-Organic Heterojunctions : Interface Engineering for Efficient Spin Injection in Organic Spintronics
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- Shi, Shengwei (author)
- Linköpings universitet,Ytors Fysik och Kemi,Tekniska högskolan
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- Sun, Zhengyi (author)
- Linköpings universitet,Ytors Fysik och Kemi,Tekniska högskolan
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- Bedoya-Pinto, Amilcar (author)
- CiC NanoGUNE Consolider, Spain
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- 2014-05-12
- 2014
- English.
- In: Advanced Functional Materials. - : Wiley. - 1616-301X .- 1616-3028. ; 24:30, s. 4812-4821
- Journal article (peer-reviewed)
Abstract
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- Ferromagnetic metal-organic semiconductor (FM-OSC) hybrid interfaces have been shown to play an important role for spin injection in organic spintronics. Here, 11,11,12,12-tetracyanonaptho-2,6-quinodimethane (TNAP) is introduced as an interfacial layer in Co-OSCs heterojunctions with an aim to tune the spin injection. The Co/TNAP interface is investigated by use of X-ray and ultraviolet photoelectron spectroscopy (XPS/UPS), near edge X-ray absorption fine structure (NEXAFS) and X-ray magnetic circular dichroism (XMCD). Hybrid interface states (HIS) are observed at Co/TNAP interfaces, resulting from chemical interactions between Co and TNAP. The energy level alignment at the Co/TNAP/OSCs interface is also obtained, and a reduction of the hole injection barrier is demonstrated. XMCD results confirm sizeable spin polarization at the Co/TNAP hybrid interface.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Annan materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Other Materials Engineering (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
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- art (subject category)
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- Li, Xin
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- Fahlman, Mats
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