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Cobalt substituted ZnO thin films: a potential candidate for spintronics

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Abstract

Cobalt doped zinc oxide thin films have been deposited using spray pyrolysis method. These single phasic films exhibited [100] preferential texture and small decrease in the lattice parameter on cobalt substitution. The films having different Co concentration have almost similar surface morphology and microstructure. These Zn1−x Co x O (x ≤ 0.10) thin films distinctly showed ferromagnetic character at room temperature. The optical transmission measurements of these films clearly proved that in these films Co substitutes for Zn2+ and exists in +2 state. Based on the optical, structural and magnetic measurements, the possibility of occurrence of ferromagnetic ordering due to cobalt clustering is ruled out in these spray-pyrolyzed films. A correlation of the observed ferromagnetic behavior in these Zn1−x Co x O films with structural change resulting from the addition of Co is presented in this paper.

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Acknowledgments

One of the authors (KPB) acknowledges CSIR, India for the research fellowship. Authors also acknowledge DIT/MHRD, Govt. of India for financial grant, and the technical support provided by Mr. Nagendra Chaudhary and Mr. Girija Bhushan Dash of the laboratory.

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Authors and Affiliations

  1. Thin Film Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi, 110016, India

    Kanwal Preet Bhatti & Sujeet Chaudhary

  2. Department of Physics, University of Fribourg, Chemin du Musse 3, Fribourg, 1700, Switzerland

    Vivek Kumar Malik

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  1. Kanwal Preet Bhatti
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  2. Vivek Kumar Malik
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  3. Sujeet Chaudhary
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Correspondence to Sujeet Chaudhary.

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Bhatti, K.P., Malik, V.K. & Chaudhary, S. Cobalt substituted ZnO thin films: a potential candidate for spintronics. J Mater Sci: Mater Electron 19, 849–854 (2008). https://doi.org/10.1007/s10854-007-9501-4

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  • DOI: https://doi.org/10.1007/s10854-007-9501-4

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