Room-temperature ferromagnetism in Fe-doped, Fe- and Cu-codoped ZnO diluted magnetic semiconductor

Magnetic properties Of Zn0.975Fe0.025O and Zn0.97Fe0.025Cu0.005O crystallites fabricated by hydrothermal method are investigated. X-ray diffraction and Raman measurements indicate that the samples have pure ZnO wurtzite structure and Fe2+ ions have substituted Zn2+ sites. Magnetic measurements indicate that Fe doping can induce room-temperature ferromagnetism, while codoping with Cu might enhance the magnetic moment but reduce the Curie temperature in ZnO. (C) 2006 Elsevier B.V. All rights reserved.