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Characteristics of Thin Films of Ferromagnetic Semiconductor Fe1.1Ti0.9O3−δ Under the Pulsed Laser Deposition Method at Different Substrate Temperatures

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Abstract

In this study, epitaxial Fe1.1Ti0.9O3−δ thin films with a smooth surface were prepared by adjusting the substrate temperature (TS) and via pulsed laser deposition (PLD) in Ar gas and α-Al2O3 (001) substrate. During the study of the optical properties and magnetism of the thin film samples, it was established that all thin films grown in Ar gas were hypoxic, having more oxygen vacancies and widening the optical band gap of the thin films significantly. The substrate temperature has a significant effect on the crystallization and magnetism of the thin films. It was established that the crystallization of a film at TS = 800 °C is the best, and the saturation magnetization reaches 172.5 emu/cc. The coercivity of films at TS = 600 °C reaches 15 kOe affected by film stress and oxygen vacancies, which is reportedly the maximum value in (1 − x)Fe2O3 − xFeTiO3. Thereafter, it decreases rapidly with the increase in TS, resulting in lattice relaxation, stress reduction, and coercivity reduction. Oxygen vacancies affect the electrical properties in thin films. In contrast to bulk materials, we established that the conduction mechanism of films changes from thermally activated transition to programmed transition with decreasing temperature.

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Funding

This work was supported by the National Natural Science Foundation of China (Grant No. 51971087) and funded by the Science and Technology Project of Hebei Education Department (Grant No. ZD2021040), the Department of Science and Technology of Hebei Province Scientific and Technological Research Project (Grant No. 15211036), and the science and technology plan projects of Zhangjiakou City (Grant No. 1611070A). National Natural Science Foundation of China,51971087,Li Ma,Funded by Science and Technology Project of Hebei Education Department,ZD2021040,Liyun Jia,the Department of Science and Technology of Hebei Province Scientific and Technological Research Project,15211036,Jialing Xu,he financial support from science and technology plan projects of Zhangjiakou City,1611070A,Jialing Xu

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Authors and Affiliations

  1. Department of Mathematics and Physics, Hebei University of Architecture, Zhangjiakou, 075000, China

    Jialing Xu, Liyun Jia, Lingjun Zhao, Pu Liu & Tao Wang

  2. College of Physics, Hebei Normal University, Shijiazhuang, 050024, China

    Ying Su, Liyun Jia, Li Ma, Ping Song & Denglu Hou

  3. Hebei Nangong Middle School Xingtai, Xingtai, 055750, China

    Ying Su

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  1. Jialing Xu
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Correspondence to Liyun Jia or Denglu Hou.

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Xu, J., Su, Y., Jia, L. et al. Characteristics of Thin Films of Ferromagnetic Semiconductor Fe1.1Ti0.9O3−δ Under the Pulsed Laser Deposition Method at Different Substrate Temperatures. J Supercond Nov Magn 35, 851–856 (2022). https://doi.org/10.1007/s10948-021-06119-y

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  • DOI: https://doi.org/10.1007/s10948-021-06119-y

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