X-ray magnetic circular dichroism and resonant photomission of V(TCNE)x hybrid magnets |
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Authors: | Tengstedt C de Jong M P Kanciurzewska A Carlegrim E Fahlman M |
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Institution: | Department of Science and Technology (ITN), Link?ping University, S-601 74 Norrk?ping, Sweden. |
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Abstract: | Thin films of V(TCNE)x were deposited in ultrahigh vacuum using a film growth technique based on in situ chemical vapor deposition of tetracyanoethylene, TCNE, and bis-benzene vanadium, V(C6H6)2. The in situ preparation method enabled, for the first time, experimental analysis of oxygen-free films. X-ray magnetic circular dichroism measurements recorded at the V L(2,3) edge confirmed room temperature magnetic ordering. A combination of conventional photoelectron spectroscopy (PES) and resonant photoemission (RPE) measured at the V L3 edge shows that the highest occupied electronic state is V(3d) derived. The rearrangements of the TCNE- related valence electronic states observed in PES and the evidence of V(3d) and TCNE- pi(pi*) orbital overlap contained in RPE spectra, indicate that strong, covalent type bonding occurs between the vanadium and the TCNE molecules. |
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