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Synthesis and characterization of bulk cobalt-doped ZnO and their thin films

Research paper by S. Karamat, R. S. Rawat, P. Lee, T. L. Tan, S. V. Springham, R. V. Ramanujan

Indexed on: 20 Feb '13Published on: 20 Feb '13Published in: Journal of Superconductivity and Novel Magnetism



Abstract

(ZnO)1−x(Co3O4)x≤0.05 thin-film series were deposited in vacuum Ar–O2 and N2 environment using the pulsed-laser deposition (PLD) technique. Bulk pellets were prepared by the solid-state reaction technique by mixing ZnO and Co3O4 powder and further utilized for deposition of thin films. XRD patterns of pellets exhibit homogeneous ZnCoO phase formation with no other impurity phases. Single-phase (002) oriented ZnCoO thin films were formed without any cobalt segregation. The cobalt core peaks confirmed the existence of +2 valence state of cobalt in thin-film samples, and the binding energy difference between the cores peaks showed the homogeneous doping of cobalt in ZnO matrix. The magnetic ordering was achieved in thin films samples which were deposited in vacuum and N2 ambience.