Abstract
Diluted magnetic semiconductors (DMS) such as cobalt-doped zinc oxide have been studied intensively during the last years, because of their possible combination of semiconducting and magnetic properties. Cobalt-doped ZnO is a DMS material with reported T C well above room temperature [1,2]. However, in other studies no ferromagnetism could be observed [3]. Due to these contradictory experimental results the nature of the ferromagnetism as well as the mechanisms of exchange coupling is still under debate. In particular, the presence of ferromagnetic inclusions — such as metallic ferromagnetic clusters — in the ZnO host crystal could be a possible origin of ferromagnetism.
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