Abstract
ZnO:Co films with room-temperature ferromagnetism have been hydrothermally grown in water at 90 °C using a ZnO seed layer on MgAl2O4 (111) substrates. High-resolution x-ray diffraction shows an epitaxial ZnO:Co single crystalline film with an out-of-plane orientation of ZnO:Co⟨001⟩∥MgAl2O4⟨111⟩ and an in-plane orientation of ZnO:Co[110]∥MgAl2O4[−1−12] and ZnO:Co[−110]∥MgAl2O4[−110]. A saturation magnetization of 0.83 emu/cm3 and a coercivity of 40 Oe were obtained for the epitaxial Zn0.98Co0.02O film at room temperature. Hydrogen unintentionally incorporated in the hydrothermal synthesis is suggested to contribute to the ferromagnetic properties in the diluted magnetic semiconductor by enhancing carrier concentration as a shallow donor.
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