High-temperature ferromagnetism in cobalt-doped ZnO single-crystalline nanorods

Co-doped ZnO single-crystalline nanorods with 80-100 nm in diameter and 1.5-2 μm in length have been prepared in a simple solution route. X-ray diffraction data and selected area electron diffraction pattern of the diluted magnetic semiconductor nanorods confirm the single crystallinity of Zn1−xCoxO solid solution without impurities of metallic Co or other phases. Magnetic results show that the Zn0.95Co0.05O nanorods exhibit a ferromagnetic characteristic with Curie temperature higher than 380 K. The high-temperature ferromagnetic properties allow this Zn1−xCoxO nanorods potential applications in future spintronic devices.