Intrinsic Ferromagnetic Ordering Research Articles

Long-range ferromagnetic ordering at room temperature inCo+ implanted TiO2 nanorods

Long-range ferromagnetic ordering at room temperature is reported for post-annealedTiO2 nanorodsdoped with Co2+ by an ion implantation technique. The catalyst free anataseTiO2 nanorods are grown normal to the substrate plane. A Curie temperature of∼320 K wasrecorded for a ∼9 at.% Co doped sample. Electronic structural studies confirm the substitutional Co in the Ti latticesite. Microstructural studies show the presence of extended defects, where a minor nonuniformityin doping concentration helps to sustain the intrinsic ferromagnetic ordering in Co dopedTiO2 at room temperature. The projected nanorod tip size is found to be smaller than a singlemagnetic domain, which may lead to an increased signal-to-noise ratio for magneticrecording.