New examination of the magnetic properties of cobalt-doped ZnO diluted magnetic semiconductors
Langue
en
Article de revue
Ce document a été publié dans
Journal of Physics D: Applied Physics. 2010, vol. 43, n° 4, p. 045001 (5 p.)
IOP Publishing
Résumé en anglais
Polycrystalline Zn<sub>1−<i>x</i></sub>Co<sub><i>x</i></sub>O diluted magnetic semiconductors were prepared within a large doping concentration range from 0.5% to 10%. Thanks to a model based on the co-existence of two ...Lire la suite >
Polycrystalline Zn<sub>1−<i>x</i></sub>Co<sub><i>x</i></sub>O diluted magnetic semiconductors were prepared within a large doping concentration range from 0.5% to 10%. Thanks to a model based on the co-existence of two magnetic populations, our analysis of the magnetization measurements brings new evidence about the competition between ferromagnetic and antiferromagnetic mean field within the ZnO diamagnetic matrix. It is a temperature activated phenomenon that supports the alignment of individual Co<sup>2+</sup> ions into superparamagnetic clusters. At the same time, the refined effective number of antiferromagnetically coupled Co<sup>2+</sup> ions is equal to the probability of Co<sup>2+</sup> ions belonging to a dimer.< Réduire
Mots clés en anglais
Magnetisms
Semiconductors
Inorganic compounds
Origine
Importé de halUnités de recherche