Producción CyT
Congreso
Autoría
A.M. Mudarra Navarro, Bilovol, V., C.E. Rodríguez Torres, F. H. Sánchez, and A.F. Cabrera
Fecha
2007
Editorial y Lugar de Edición
LNLS
Resumen
Información suministrada por el agente en
SIGEVA
Understanding the origin of the magnetism in diluted magnetic semiconductors produced by doping non-magnetic semiconductors with transition metal ions is actually a subject of interest [1?3]. Most reported models for the observed magnetic behaviour are based on the interaction among magnetic impurities which can be mediated by oxygen or by free carriers. Then, oxygen vacancies may have a great influence on the magnetic properties of these compounds. Coey et al. have observed ferromagnetic behav...
Understanding the origin of the magnetism in diluted magnetic semiconductors produced by doping non-magnetic semiconductors with transition metal ions is actually a subject of interest [1?3]. Most reported models for the observed magnetic behaviour are based on the interaction among magnetic impurities which can be mediated by oxygen or by free carriers. Then, oxygen vacancies may have a great influence on the magnetic properties of these compounds. Coey et al. have observed ferromagnetic behaviour in Fe-doped SnO2 and they have proposed that F-center exchange is responsible for the ferromagnetic coupling between Fe ions [4]. Since oxygen vacancy concentration can be modified by adequate thermal treatment, in this work we have studied the Fe local environment in Sn0:9Fe0:1O2 powders produced by ball milling and subjected to annealing under different atmospheres, by x-ray absorption (XAS).
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Palabras Clave
magnetic dilute semiconductorsFe doped SnO2XAFS