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Photoelectron spectroscopy of CVD grown thin films of V(TCNE)x - organic-based room temperature magnet

Anna Kanciurzewska 1Carl A. Tengstedt 1Michel De Jong 2Elin Carlegrim 1William R. Salaneck 2Mats Fahlman 1

1. Department of Science and Technology (ITN), Campus Norrkoping, Bredgatan 33, Norrköping SE60174, Sweden
2. Department of Physics, Chemistry and Biology (IFM), Campus Valla, Linkoping SE58183, Sweden


V(TCNE)x, is especially interesting since it features an ordering temperature above room temperature (TC~400K) [1]. We have prepared and characterized thin films of V(TCNE)x in ultra-high vacuum using a novel film growth technique based on in-situ chemical vapor deposition of tetracyanoethylene and bis-benzene vanadium. The in-situ preparation method enabled, for the first time, experimental analysis of the electronic structure [2]. N(1s) and C(1s) XPS spectra clearly indicate the predominant presence of TCNE-. The charge state of the vanadium ion was assigned as V2+, using the XPS V(2p) peak positions. Upon comparing the valence band spectra with those of two model compounds, condensed TCNE and Rb-intercalated TCNE [3], strong modifications are observed in the TCNE-related states in V(TCNE)x that point to a covalently bonded network as opposed to an ionic charge transfer complex. The electronic, chemical structure and the magnetic properties of V(TCNE)x are studied using synchrotron radiation techniques such as photoelectron spectroscopy (PES), resonant photoelectron spectroscopy (RPES), near edge X-ray absorption fine structure spectroscopy (NEXAFS), and X-ray magnetic circular dichroism (XMCD).


1. K.I. Pokhodnya, A.J. Epstein and J.S. Miller, Adv. Mat. 12, 410-13 (2000).

2. C. Tengstedt, M. P. de Jong, A. Kanciurzewska, E. Carlegrim, W.R. Salaneck and M. Fahlman, Phys. Rev. Lett. 96, 057209 (2006).

3. C. Tengstedt, M. Unge, M.P.d. Jong, S. Stafstrom, W.R. Salaneck and M. Fahlman, Physical Review B (Condensed Matter and Materials Physics) 69, 165208-1-7 (2004).


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Presentation: Poster at E-MRS Fall Meeting 2006, Symposium E, by Anna Kanciurzewska
See On-line Journal of E-MRS Fall Meeting 2006

Submitted: 2006-05-14 15:16
Revised:   2009-06-07 00:44