Abstract
Abstract X-ray diffraction, magnetic measurement and electron microscopic studies on co-sputtered Zn 1− x Co x O single crystalline films showed the solubility limit to be about x = 0.58. An increase of Co greater than 0.58 resulted in the growth of Co rods elongated in the growth direction in a matrix of ZnCoO solid solution at a substrate temperature of 673 K. Above a substrate temperature of 873 K, the ZnCo 2 O 4 spinel phase rather than the Co metal phase was seen. Annealing of as-sputtered films with a single phase of Zn 1− x Co x O in air led to the decomposition of a two-phase structure of Zn 1− x Co x O wurtzite and ZnCo 2 O 4 spinel and the decrease of the solubility limit of Co in ZnO to about x = 0.2.
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