X-ray absorption and magnetic circular dichroism characterization of Mo1-xFexO2 (x = 0-0.05) thin films grown by pulsed laser ablation
- X-ray absorption and magnetic circular dichroism characterization of Mo1-xFexO2 (x = 0-0.05) thin films grown by pulsed laser ablation
- P. Thakur; J. C. Cezar; N. B. Brookes; R. J. Choudhary; D. M. Phase; 채근화; R. Kumar
- X-ray absorption spectroscopy; XMCD; Electronic structure
- Issue Date
- Hyperfine interactions
- VOL 197, 95-100
- The electronic and magnetic properties of well characterized Mo1−xFexO2
(x = 0–0.5) thin films that show ferromagnetism at room temperature (RT) have been
investigated by the means of near edge x-ray absorption fine structure (NEXAFS)
and x-ray magnetic circular dichroism (XMCD) experiments at the O K-, Fe L-,
and Mo M-edges. The NEXAFS spectra at O K- and Mo M3,2-edges show a strong
hybridization of O 2p-4d Mo orbitals, and Mo ions change their symmetry with
the substitution of Fe ions into MoO2 matrix. The Fe 2p NEXAFS/XMCD spectra
exhibit multiple absorption peaks and an appreciableXMCDsignal that persists even
at RT. These results demonstrate that Fe is in a mixed valence state of Fe2+–Fe3+,
substituting at theMo site and that the Fe2+/3+ ions are ferromagnetically polarized.
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