Journal of Applied Physics · 2011 · 24 citations · 25 references
Magnetic PropertiesEngineeringChemistryMagnetic MaterialsMagnetoresistanceMagnetismMultiferroicsFerroelectric ApplicationMaterials ScienceCo-doped Fe3o4 FilmsMagnetic MaterialFerromagnetismNatural SciencesApplied PhysicsCondensed Matter PhysicsPure Fe3o4 FilmThin FilmsValence Band StructureMagnetic PropertyFunctional Materials
Structural and magnetic properties, and the valence band structure of pure and Co-doped (up to 33%) Fe3O4(100) films were investigated. Reconstruction of the Fe3O4(100) surface is found to be blocked by Co doping. Doped Co ions in Fe3O4 are in a charge state of 2 + and substitute the Fe2+ in the B site of Fe3O4. All the films exhibit room temperature ferromagnetism. Co doping changes the coercivity and reduces saturation magnetization. The density of states near the Fermi level is reduced by Co doping due to the decrease of Fe2+ in the B site, which might responsible for the decrease in conductivity and magnetoresistance of Co-doped Fe3O4. The Verwey transition in the range of 100–120 K is observed for the pure Fe3O4 film, while no transition could be detected for Co-doped Fe3O4 films.
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Stefan Wolf, D. D. Awschalom, R. A. Buhrman et al. · Science · 2001 · 11.3K citations