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Title: Magnetic structures of FeTiO{sub 3}-Fe{sub 2}O{sub 3} solid solution thin films studied by soft X-ray magnetic circular dichroism and ab initio multiplet calculations

The solid solutions between ilmenite (FeTiO{sub 3}) and hematite (α-Fe{sub 2}O{sub 3}) have recently attracted considerable attention as a spintronic material due to their interesting magnetic and electrical properties. In this study, the electronic and magnetic structures of epitaxially grown 0.6FeTiO{sub 3}·0.4Fe{sub 2}O{sub 3} solid solution thin films were investigated by combining x-ray absorption near-edge structure (XANES), x-ray magnetic circular dichroism (XMCD) for two different crystallographic projections, and first-principles theoretical calculations. The Fe L-edge XANES and XMCD spectra reveal that Fe is in the mixed-valent Fe{sup 2+}–Fe{sup 3+} states while Fe{sup 2+} ions are mainly responsible for the magnetization. Moreover, the experimental Fe L-edge XANES and XMCD spectra change depending on the incident x-ray directions, and the theoretical spectra explain such spectral features. We also find a large orbital magnetic moment, which can originate the magnetic anisotropy of this system. On the other hand, although the valence state of Ti was interpreted to be 4+ from the Ti L-edge XANES, XMCD signals indicate that some electrons are present in the Ti-3d orbital, which are coupled antiparallel to the magnetic moment of Fe{sup 2+} ions.
Authors:
 [1] ; ; ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ; ;  [7]
  1. Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama, Kanagawa 226-8503 (Japan)
  2. Department of Material Chemistry, Kyoto University, Nishikyo, Kyoto 615-8510 (Japan)
  3. Fukui Institute for Fundamental Chemistry, Kyoto University, Sakyo, Kyoto 606-8103 (Japan)
  4. Institute of Industrial Science, The University of Tokyo, 4-6-1 Meguro, Tokyo 153-8505 (Japan)
  5. Department of Material Science and Engineering, Kyoto University, Sakyo, Kyoto 606-8501 (Japan)
  6. Japan Synchrotron Radiation Research Institute, SPring-8, Sayo, Hyogo 679-5198 (Japan)
  7. Japan Atomic Energy Agency, SPring-8, Sayo, Hyogo 679-5148 (Japan)
Publication Date:
OSTI Identifier:
22257721
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION SPECTROSCOPY; ELECTRICAL PROPERTIES; FERRITES; HEMATITE; ILMENITE; IRON IONS; IRON OXIDES; MAGNETIC CIRCULAR DICHROISM; SOFT X RADIATION; SOLID SOLUTIONS; THIN FILMS; TITANATES; X-RAY SPECTROSCOPY