Magnetic and Transport Properties of Nanocomposite Fe/Fe₃₋δO₄ and Fe₃₋δO₄ Films Prepared by Plasma-enhanced Chemical Vapour Deposition
Reflective, pinhole-free Fe/Fe3O4 and Fe3−δO4/Fe2O3 nanocomposite films were obtained by reacting iron pentacarbonyl, Fe(CO)5, in an inductively-coupled radio frequency glow discharge reactor. The conductivity of the Fex/(Fe3O4)1−x (x > 7%) composite films exhibits metallic characteristics and the conductivity decreases as the α-Fe content decreases. The metal-to-insulator transition temperature of the Fex/(Fe3O4)1−x (x ∼0.07) films shifts to a higher temperature as compared with Fe3−δO4 due to the increased conductivity from α-Fe. The magnetization versus temperature (M-T) curves show the transition temperature ranging from 95 to 136 K, corresponding to the Verwey temperature, which is dependent on the film composition. The Fe3−δO4 film exhibits a negative magnetoresistance of about 4% and 8% at room temperature and 80 K, respectively.
J. Yang et al., "Magnetic and Transport Properties of Nanocomposite Fe/Fe₃₋δO₄ and Fe₃₋δO₄ Films Prepared by Plasma-enhanced Chemical Vapour Deposition," Journal of Physics D: Applied Physics, Institute of Physics - IOP Publishing, Apr 2005.
The definitive version is available at http://dx.doi.org/10.1088/0022-3727/38/8/019
Materials Science and Engineering
United States. Department of Energy
Keywords and Phrases
Alpha Iron; Chemical Vapor Deposition; Composition and Phase Identification; Magnetic Phase Boundaries; Thin Films
Article - Journal
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