Oxide-diluted magnetic semiconductors (O-DMS) have attracted a great deal of interest in
recent years due to the possibility of inducing room temperature ferromagnetism. These
materials are of particular interest for spintronic devices such as spin valves. This review
describes the experimental status of the O-DMS including the recent results on ZnO- and
TiO2-based
systems.
We report on the synthesis of high-quality Co-doped ZnO thin films using the pulsed laser deposition technique on (0001)-Al 2 O 3 substrates performed in an oxidizing atmosphere, using Zn and Co metallic targets. We firstly optimized the growth of ZnO in order to obtain the less strained film. Highly crystallized Co:ZnO thin films are obtained by an alternative deposition from Zn and Co metal targets. This procedure allows an homogenous repartition of the Co in the ZnO wurzite structure which is confirmed by the linear dependance of the out-of-plane lattice parameter as a function of the Co dopant. In the case of 5% Co doped, the film exhibits ferromagnetism with a Curie temperature close to the room temperature.
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