We have investigated properties of the Cu-doped ZnO crystalline film synthesized by the hydrothermal method. X-ray diffraction and X-ray photoelectron spectroscopy results provide the evidence that Cu2 + is incorporated into the ZnO lattices. Photoluminescence spectrum of the rod arrays shows that the UV emission peak shifts a little to lower energy and its intensity decreased. There are another two emission peaks centred in blue and green regions because of the incorporation of Cu2 + ions. The rod arrays have exhibited room-temperature ferromagnetic behaviour with the remanence of 0·926 × 10 − 3 emu/cm3. We suggest that the exchange interaction between local spin-polarized electrons (such as the electrons of Cu2 + ions) and conductive electrons is the cause of room-temperature ferromagnetism.
展开▼
