Electrodeposition of CoₓFe₃₋ₓO₄ Epitaxial Films and Superlattices
Spinel ferrites are of interest because of their potential applications in spintronics (spin-based electronics) and solid-state memories. Cobalt ferrite (CoFe₂O₄ ) is an inverse spinel ferrite. Currently, the utility of CoFe₂O₄ is mainly based on its high coercivity and magnetocrystalline anisotropy. The magnetic and electrical properties of CoFe₂O₄ depend on its Co:Fe ratio. In this paper, a one-step electrodeposition of CoₓFe₃₋ₓO₄ (0 < x < 1 ) thin films from an alkaline Fe³⁺- and Co²⁺ -triethanolamine solution is presented. The Co:Fe ratio in the CoₓFe₃₋ₓO₄ thin films can be tuned by controlling the deposition potential. That is, CoₓFe₃₋ₓO₄ thin films with tunable chemical and physical properties can be produced from a single solution. Superlattices in the CoₓFe₃₋ₓO₄ system were also electrodeposited from the same solution by simply pulsing between two potentials. Compared to CoₓFe₃₋ₓO₄ individual films, superlattices exhibit resistance switching and a more pronounced negative differential resistance (NDR) feature at lower current during perpendicular transport measurements, which could be used in resistive random access memories.
Z. He et al., "Electrodeposition of CoₓFe₃₋ₓO₄ Epitaxial Films and Superlattices," Chemistry of Materials, American Chemical Society (ACS), Jan 2013.
The definitive version is available at http://dx.doi.org/10.1021/cm303289t
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