Single-phase CrO 2 nanostructured thin films have been grown directly on MgO͑100͒ by pulsed laser ablation of a metallic Cr target in an O 2 environment. X-ray diffraction shows that these films are strained and consist of CrO 2 crystallites with two possible epitaxial relationships to the substrate; either CrO 2 ͑110͒ or CrO 2 ͑200͒ is parallel to MgO͑100͒. Scanning electron microscopy and atomic force microscopy reveal orthogonally arranged nanoneedles and platelike structures ͑both 30-50 nm thick͒. X-ray photoemission confirms that the films are primarily CrO 2 covered with a thin CrO 3 overlayer and indicates its complete synthesis without any residual metallic Cr.
The field electron emission (FEE) properties of nitrogen-incorporated nanocrystalline diamond films were enhanced due to Li-ion implantation/annealing processes. Li-ion implantation mainly induced the formation of electron trap centers inside diamond grains, whereas post-annealing healed the defects and converted the a-C phase into nanographite, forming conduction channels for effective transport of electrons. This resulted in a high electrical conductivity of 11.0 S/cm and enhanced FEE performance with a low turn-on field of 10.6 V/lm, a high current density of 25.5 mA/cm 2 (at 23.2 V/lm), and a high lifetime stability of 1,090 min for nitrogen incorporated nanocrystalline diamond films. Published by AIP Publishing.
FeMoO 6 films have been grown on a Si͑100͒ substrate by pulsed laser deposition under different growth conditions including deposition temperature and time. A nanocrystalline single-phase Sr 2 FeMoO 6 film was obtained at a temperature as low as 600°C. This high-quality ferromagnetic film was found to have a saturation magnetic moment of 3.4 B per formula unit and a coercive field of 1.5 kOe at 77 K with micrometer-sized magnetic domains. By using glancing-incidence x-ray diffraction with different incident beam angles, the crystal structure of the film was sampled as a function of depth. For the as-grown Sr 2 FeMoO 6 films thicker than 60 nm, a preferential orientation of the nanocrystals in the film was observed, despite the lack of good lattice matching with the Si substrate. At a higher deposition temperature of 800°C, the as-grown film exhibited the same saturation magnetic moment but with a discernibly lower coercive field of 0.8 kOe, consistent with the larger grain size obtained at a higher growth temperature.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.