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Structural, optical, and magnetic properties of Co-doped ZnO nanocrystalline thin films for spintronic devices

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Abstract

Different compositions of Zn1−xCoxO (0 ≤ x ≤ 0.15) nanocrystalline compounds were produced in terms of ball milling method, thin films of these compounds were prepared by electron beam evaporation method. XRD pattern was utilized to study the structural properties of these films. Hexagonal wurtzite-type structure was displayed for all of the films. Using XRD pattern, the crystallite and lattice strain were calculated. The crystallite size decreases but the lattice strain's value rises up with accumulating dopants of Co. Increasing in lattice strain may be related to the increase in the concentration of lattice imperfections. The optical constants, n and k of the Zn1−xCoxO nanocrystalline films were calculated in terms of spectroscopic ellipsometry measurements in a range of 300–1100 nm. With more doping of Co, the refractive index showed an increase, as well. According to Tauc relation, the optical energy gap of the Zn1−xCoxO films was calculated and proved to be direct transition. The energy gap found to be decreased with the increasing of the Co concentration. In addition, studying the magnetic properties of Zn1−xCoxO films reveal room temperature ferromagnetism.

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Acknowledgements

The authors acknowledge the Deanship of Scientific Research at King Faisal University for financial support under Nasher Track (Grant No. 186287). In addition, the authors are grateful to Al-Azhar University for supporting with some of experimental measurements.

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Authors and Affiliations

  1. Physics Department, College of Science, King Faisal University, KSA, Al Hufuf, Saudi Arabia

    Abdullah F. AL Naim

  2. Physics Department, Faculty of Science, Al-Azhar University, Assiut, 71542, Egypt

    A. Solieman & E. R. Shaaban

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  1. Abdullah F. AL Naim
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  2. A. Solieman
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  3. E. R. Shaaban
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Correspondence to E. R. Shaaban.

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AL Naim, A.F., Solieman, A. & Shaaban, E.R. Structural, optical, and magnetic properties of Co-doped ZnO nanocrystalline thin films for spintronic devices. J Mater Sci: Mater Electron 31, 3613–3621 (2020). https://doi.org/10.1007/s10854-020-02916-8

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  • DOI: https://doi.org/10.1007/s10854-020-02916-8

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