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Applied Physics A

, 124:835 | Cite as

Tuning optical and magnetic properties of nanocrystalline BaTiO3 films by Fe doping

  • Huiping Gao
  • Jianjun TianEmail author
  • Furui Tan
  • Haiwu Zheng
  • Weifeng Zhang
Article
  • 76 Downloads

Abstract

Fe-doped BaTiO3 is a promising multiferroics material due to its appealing physical properties and potential applications in sensors, transducers and non-volatile memories and multilayer capacitors. Herein, Fe-doped BaTiO3 nanocrystalline films were deposited on silicon substrates by chemical solution route. The relation between Fe content and the optical and magnetic properties of the samples was analyzed. X-ray diffraction data show that the films are tetragonal with P4mm space group. The atomic force microscopy measurement indicates that the film surface roughness increases with Fe composition. The optical response behavior of the films was investigated by Adachi’s dielectric function model with fitting ellipsometric spectra in the photon energy 1.5–4.13 eV. With increasing Fe content, the real part of dielectric functions gradually decreases in the transparent region. Moreover, EOBG (the optical band gap) is reduced with increasing Fe composition x, and the relationship between them is EOBG = (3.817–1.440 × x) eV. All Fe-doped films show weak ferromagnetism coming from the bound magnetic polarons and exchange interaction between oxygen vacancies and Fe3+ in the films. When iron content x exceeds 0.06, the magnetization values of the samples exhibit an unsaturated characteristic at more than 3000 Oe magnetic fields, which is due to the competition between the ferromagnetism and the antiferromagnetism of two Fe3+ ions superexchange. These results suggest that optical and magnetic properties of Fe-doped BaTiO3 nanocrystalline films can be changed by Fe composition.

Notes

Acknowledgements

The authors are grateful to Dr. L J Guo and S J Liu for the technical support. This work was supported by Postdoctoral Science Foundation of Henan Province (2012021, 2015048), Scientific and Technological Project in Henan Province (172102210013), Science Project of Education Department of Henan Province (17B140001, 14B140022) and Science and Technology Development Project of Henan Province (152300410060, 162102210170).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Huiping Gao
    • 1
  • Jianjun Tian
    • 1
    Email author
  • Furui Tan
    • 1
  • Haiwu Zheng
    • 1
  • Weifeng Zhang
    • 1
  1. 1.Henan Key Laboratory of Photovoltaic Materials & School of Physics and ElectronicsHenan UniversityKaifengChina

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