Hybrid Interface States and Spin Polarization at Ferromagnetic Metal-Organic Heterojunctions: Interface Engineering for Efficient Spin Injection in Organic Spintronics

Ferromagnetic metal-organic semiconductor (FM-OSC) hybrid interfaces have 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 heterojunction with an aim to tune the sp...

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Bibliographic Details
Published in:arXiv.org 2014-03
Main Authors: Shi, Shengwei, Sun, Zhengyi, Bedoya-Pinto, Amilcar, Graziosi, Patrizio, Li, Xin, Liu, Xianjie, Hueso, Luis, Dediu, Valentin A, Luo, Yi, Fahlman, Mats
Format: Article
Language:English
Subjects:
Dichroism
Electrons
Energy levels
Ferromagnetism
Fine structure
Heterojunctions
Organic chemistry
Photoelectrons
Polarization (spin alignment)
Spintronics
X ray absorption
X ray photoelectron spectroscopy
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Summary:Ferromagnetic metal-organic semiconductor (FM-OSC) hybrid interfaces have 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 heterojunction 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 interface resulting from chemical interaction between Co and TNAP. The energy level alignment at 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.
ISSN:2331-8422
DOI:10.48550/arxiv.1403.5390