Influence of Fe2O3 on the tunnelling structure and magnetic properties of zinc ferrite

Chin J Mater Res

2004, Vol. 18

Issue (1): 34-34 DOI:

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Influence of Fe2O3 on the tunnelling structure and magnetic properties of zinc ferrite

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1.南京师范大学;2.南京大学固体微结构国家实验室

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;. Influence of Fe2O3 on the tunnelling structure and magnetic properties of zinc ferrite. Chin J Mater Res, 2004, 18(1): 34-34.

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Abstract Two-phase nanostructure ZnFe2O4/Fe2O3 had been prepared by the sol-gel method and heat treatment. The structure had been analyzed by X-ray diffraction (XRD) and high-resolution electron microscope (HREM). The results indicate that superfluous Fe2O3 composition is the necessary condition to form tunneling structure in two-phase ferrite. The tunneling structure was directly observed by HREM in two-phase ferrite and the insulating layer of ?-Fe2O3 located in interface between ferrets. The two-phase ferrite has non-Ohmic character of I-V curve and tunneling magnetoresistance. The one-phase ferrite has linear-Ohmic character of I-V curve and small magnetoresistance of ferrite. Phase-transformation dynamics in two-phase ferrite show that crystallization of ?-Fe2O3 is controlled by interface or surface.

Key words: inorganic non-metallic materials tunneling structure tunneling magnetoresistance ferrite

Received: 20 January 2003

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