“Structural and magnetic properties in mechanically alloyed Zn1-xCoxO semiconductor powders”

L. C. DAMONTE; M.A.HERNÁNDEZ-FENOLLOSA; M.MEYER; L.A.MENDOZA-ZÉLIS; B.MARÍ

Bs.As., Argentina

Congreso; At the Frontiers of Condensed Matter III, New Trends in Structural, Electronic and Magnetic Properties of Matter, , 11-15 de diciembre de 2006.; 2006

TANDAR,

Thin films and nanostructured thin films of the transparent magnetic semiconductor alloy Zn1-xCoxO has been extensively studied due to its attractive properties for optoelectronic and spintronic applications. However, the mechanism responsible of such singular ferromagnetic behaviour is not yet well understood. The object of this work is the preparation and structural and magnetic characterization of Zn1-xCoxO powders. Our purpose is to investigate the basic properties on bulk materials in order to contribute to the comprehension of the magnetic character in these semiconductors. The samples were obtained by mechanical alloying the binary oxides ZnO and CoO at different concentrations and milling times. The cation substitution was verified by X-ray diffraction. The magnetic properties were evaluated by field-cooled and zero-field-cooled magnetization measurements.