The fabrication and magnetic properties of nanowire-like iron oxide

• Published in: Journal of physics. Condensed matter Vol. 16; no. 25; pp. 4541 - 4548
• Main Authors: Zhang, L Y, Xue, D S, Xu, X F, Gui, A B, Gao, C X
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 30.06.2004; Institute of Physics
• 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; Inorganic compounds; Transition element compounds; Magnetic moments; Polycrystals; Superparamagnetism; Experimental study; Preferred orientation; Nanoparticles; Magnetic particles; Anodizing; Fine particle; Electrodeposition; Property structure relationship; Nanowires; Iron oxides; Perpendicular magnetic anisotropy; Magnetic properties
• ISSN: 0953-8984; 1361-648X
• DOI: 10.1088/0953-8984/16/25/011

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.