Electrodeposition of CoₓFe₃₋ₓO₄ Epitaxial Films and Superlattices

Abstract

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.

Department(s)

Chemistry

International Standard Serial Number (ISSN)

0897-4756

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2013 American Chemical Society (ACS), All rights reserved.

Publication Date

01 Jan 2013

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