Title: Enhanced Magnetic Anisotropy via Quasi-Molecular Magnet at Organic-Ferromagnetic Contact
Authors: Hsu, Yao-Jane
Lai, Yu-Ling
Chen, Chih-Han
Lin, Ying-Chang
Chien, Hsiu-Yun
Wang, Jeng-Han
Lam, Tu-Ngoc
Chan, Yuet-Loy
Wei, D. H.
Lin, Hong-Ji
Chen, Chien-Te
Graduate Program of Nanotechnology , Department of Materials Science and Engineering
Issue Date: 17-Jan-2013
Abstract: To realize the origin of efficient spin injection at organic-ferromagnetic contact in organic spintronics, we have implemented the formation of quasi-molecular magnet via surface restructuring of a strong organic acceptor, tetrafluoro-tetracyanoquinodimethane (F4-TCNQ), in contact with ferromagnetic cobalt. Our results demonstrate a spin-polarized F4-TCNQ layer and a remarkably enhanced magnetic anisotropy of the Co film. The novel magnetic properties are contributed from strong magnetic coupling caused by the molecular restructuring that displays an angular anchoring conformation of CN and upwardly protruding fluorine atoms. We conclude that the pi bonds of CN, instead of the lone-pair electrons of N atoms, contribute to the hybridization-induced magnetic coupling between CN and Co and generate a superior magnetic order on the surface.
URI: http://dx.doi.org/10.1021/jz301757x
ISSN: 1948-7185
DOI: 10.1021/jz301757x
Volume: 4
Issue: 2
Begin Page: 310
End Page: 316
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