The fabrication and magnetic properties of nanowire-like iron oxide

Nanowire-like iron oxides *a-Fe2O3, Fe3O4 and y-Fe2O3) of diameter about 200 nm and length up to 8 *mm were assembled into anodic aluminium oxide templates through electrodeposition followed by a heat-treating process. These wires have polycrystalline structures and consist of fine particles whose m...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2004-06, Vol.16 (25), p.4541-4548
Main Authors: Zhang, L Y, Xue, D S, Xu, X F, Gui, A B, Gao, C X
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Diamagnetism, paramagnetism and superparamagnetism
Exact sciences and technology
Magnetic properties and materials
Magnetic properties of nanostructures
Physics
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Summary:Nanowire-like iron oxides *a-Fe2O3, Fe3O4 and y-Fe2O3) of diameter about 200 nm and length up to 8 *mm were assembled into anodic aluminium oxide templates through electrodeposition followed by a heat-treating process. These wires have polycrystalline structures and consist of fine particles whose magnetic moments have preferred orientations in the templates. Some unique magnetic properties, such as perpendicular magnetic anisotropy in Fe3O4 wires, reduced transition temperature in *a-Fe2O3 and Fe3O4 wires, and superparamagnetism in y-Fe2O3 wires, were observed. The properties can be understood by their unique structures induced by reduced dimension and the competition of the shape and crystalline anisotropy.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/16/25/011