Structural and magnetic properties of ZnO:TM (TM: Co,Mn) nanopowders

D RUBI; A. CALLEJA; J. ARBIOL; X.G. CAPDEVILA; M. SEGARRA; LL. ARAGONES; J. FONTCUBERTA

San Sebastian, Espana

Congreso; Joint European Magnetic Symposia; 2006

We report on the structural and magnetic characterization of Co0.1Zn0.9O and Mn0.1Zn0.9O nanopowders obtained by a soft chemistry route. We show that those samples fired at low temperatures display a ferromagnetic interaction that cannot be attributed to the presenceof impurities. A magnetic aging mechanism is observed, reflecting the key role played by defects in the stabilization of ferromagnetism in this kind of diluted magnetic semiconductors.