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

Abstract

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 Zn 1− x Co x O solid solution without impurities of metallic Co or other phases. Magnetic results show that the Zn 0.95Co 0.05O nanorods exhibit a ferromagnetic characteristic with Curie temperature higher than 380 K. The high-temperature ferromagnetic properties allow this Zn 1− x Co x O nanorods potential applications in future spintronic devices.