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Semiconductor Behavior and Room Temperature Ferromagnetism in e-Beam Evaporated Co/TiO2 Multilayer Thin Films

Physics of the Solid State volume 61, pages 1363–1369 (2019)Cite this article

Abstract

The Co/TiO2 multilayer thin films have been deposited by e-beam evaporation method on glass substrates in vacuum and annealed in air at 773 K for 1 h. The crystal structure, surface morphology, optical properties, electrical properties and magnetic properties of Co/TiO2 multilayer thin films have been systematically investigated. The results showed that the particle sizes were significantly reduced when the samples are annealed and the enlargement of particle size occurred when the samples thickness is increased. The spectroscopic analysis exhibited enhanced transmittance and higher optical band gap of annealed sample than the as-deposited one and it was decreased with sample thickness. The resistivity measurement confirmed resistivity decreament with temperature. Furthermore, by investigating the magnetic properties, room temperature ferromagnetism was observed.

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ACKNOWLEDGMENTS

The authors would like to acknowledge the support of the Department of Applied Physics and Electronic Engineering, Rajshahi University, Central Science Laboratory, Rajshahi University and Atomic Energy Centre, Dhaka for essential samples preparation and characterization. The authors also greatefully appreciate the financial support from the Ministry of Science and Technology of Bangladesh.

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Authors and Affiliations

  1. Department of Physics, Rajshahi University of Engineering and Technology, 6204, Rajshahi, Bangladesh

    Md. Faruk Hossain & M. A. Islam

  2. Department of Applied Physics and Electronic Engineering, University of Rajshahi, 6205, Rajshahi, Bangladesh

    M. A. I. Nahid

  3. Department of Computer Science and Engineering, Varendra University, 6205, Rajshahi, Bangladesh

    Md. Sarwar Pervez

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  1. Md. Faruk Hossain
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  2. M. A. I. Nahid
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  3. Md. Sarwar Pervez
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  4. M. A. Islam
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Correspondence to Md. Faruk Hossain.

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Hossain, M.F., Nahid, M.A., Pervez, M.S. et al. Semiconductor Behavior and Room Temperature Ferromagnetism in e-Beam Evaporated Co/TiO2 Multilayer Thin Films. Phys. Solid State 61, 1363–1369 (2019). https://doi.org/10.1134/S1063783419080298

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  • DOI: https://doi.org/10.1134/S1063783419080298

Keywords:

  • Co/TiO2 multilayer
  • e-beam evaporation method
  • grain size
  • band gap
  • room temperature ferromagnetism