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X-ray absorption and magnetic circular dichroism characterization of Mo1–xFexO2 (x = 0–0.05) thin films grown by pulsed laser ablation

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Abstract

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 appreciable XMCD signal that persists even at RT. These results demonstrate that Fe is in a mixed valence state of Fe2 + –Fe3 + , substituting at the Mo site and that the Fe2 + /3 +  ions are ferromagnetically polarized.

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Authors and Affiliations

  1. European Synchrotron Radiation Facility, BP220, 38043, Grenoble Cedex, France

    P. Thakur, J. C. Cezar & N. B. Brookes

  2. UGC-DAE Consortium for Scientific Research, Indore, 452001, India

    R. J. Choudhary & D. M. Phase

  3. Nano Analysis Centre, Korea Institute of Science and Technology (KIST), Seoul, 136-791, Korea

    K. H. Chae

  4. Centre for Materials Science and Engineering, National Institute of Technology, Hamirpur, 177005 (H.P), India

    Ravi Kumar

Authors
  1. P. Thakur
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  2. J. C. Cezar
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  3. N. B. Brookes
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  4. R. J. Choudhary
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  5. D. M. Phase
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  6. K. H. Chae
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  7. Ravi Kumar
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Correspondence to P. Thakur.

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Thakur, P., Cezar, J.C., Brookes, N.B. et al. X-ray absorption and magnetic circular dichroism characterization of Mo1–xFexO2 (x = 0–0.05) thin films grown by pulsed laser ablation. Hyperfine Interact 197, 95–100 (2010). https://doi.org/10.1007/s10751-010-0247-7

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  • DOI: https://doi.org/10.1007/s10751-010-0247-7

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