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

Magnetic properties of Zn 0.975 Fe 0.025 O and Zn 0.97 Fe 0.025 Cu 0.005 O crystallites fabricated by hydrothermal method are investigated. X-ray diffraction and Raman measurements indicate that the samples have pure ZnO wurtzite structure and Fe 2+ ions have substituted Zn 2+ 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.