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
- The electronic and magnetic properties; NEXAFS; XMCD; X-ray absorption spectroscopy; Electronic structure
- Issue Date
- 3rd Joint International Conference on Hyperfine Interactions and International Symposium on Nuclear Quadrupole Interactions
- In the several last years, molybdenum oxide has attracted attention because of its potential applications in gas sensing devices,
optically switchable coatings, catalysis, etc. Besides the above-mentioned attractive physical and optical applications, if another
degree of dimensionality in terms of magnetic properties could be induced in the system by doping some magnetic impurity, the
resulting device would be a boost to the existing MoOx based technology. This is the aim of this study.
Well characterized thin films of undoped and Fe (0–5 at. %) doped MoO2 were grown on c-plane sapphire single crystal substrates
by pulsed laser ablation technique [1,2]. The near edge X-ray absorption fine structure (NEXAFS) measurement at O K, Mo M3,2,
Fe L3,2-edges, and X-ray Magnetic Circular Dichroism (XMCD) at Fe L3,2-edges have been carried at the ID08 beam line of the
European Synchrotron Radiation Facility to understand the electronic structure changes, relative stability of cation distributions
and the responsible magnetic interactions at room temperature. The O K-edge NEXAFS spectra reveal that the intensity of O
2p–Mo 4p hybridized states changes with the Fe dilution and can be interpreted in terms of competition between hybridization of
Mo 4p and Fe 3d with O 2p orbitals. The Mo M-edges exhibit a signature of mixed valance Mo4+/Mo5+ ions. The Fe L3,2
absorption spectra shows a similar spectral profile; on the other hand, the XMCD spectra show the characteristic fine structure with
ferromagnetic ordering at room temperature. These differences are attributed to the variety of 3d electron configuration of Fe ions
(Fe2+/Fe3+) and the local symmetry (tetrahedral/octahedral) . The cation distributions at different sites exhibit a significant
variation with the change in iron concentration indicating the strong correlations between charge and spin of the electrons.
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