Cobalt substituted ZnO thin films: a potential candidate for spintronics

Bhatti, Kanwal Preet; Malik, Vivek Kumar; Chaudhary, Sujeet

doi:10.1007/s10854-007-9501-4

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Journal article

Cobalt substituted ZnO thin films: a potential candidate for spintronics

Bhatti, Kanwal Preet Thin Film Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi, India
Malik, Vivek Kumar Department of Physics, University of Fribourg, Switzerland
Chaudhary, Sujeet Thin Film Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi, India

05.12.2007

Published in:

Journal of Materials Science: Materials in Electronics. - 2008, vol. 19, no. 8-9, p. 849-854

English 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 Zn_1−xCo_xO (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 Zn_1−xCo_xO films with structural change resulting from the addition of Co is presented in this paper.

Faculty

Faculté des sciences et de médecine

Department

Département de Physique

Language