Abstract
High-energy ball milling (mechanical alloying) has been widely used for the production of amorphous or nanocrystalline materials. Recently, mechanical alloying has been introduced as a method for the preparation of magnetic materials. Ceramic/metal nanocomposites have also received increased attention because of their unique mechanical, electrical and magnetic properties. As is well known, ceramic magnetic materials are not only economic permanent magnets, but are also widely used soft magnets for high frequency applications because of their excellent electrical properties. However, the magnetic properties of ceramic materials (such as the maximum energy product for permanent magnets and the permeability for soft magnets) are far below those obtained in metallic compounds because of their low saturation magnetizations, e.g., the magnetization of {alpha}-Fe s more than twice that of Fe{sub 3}O{sub 4}. In this paper the authors report the results of a study of the structure and magnetic properties of nano-composites of Fe/Fe{sub 3}O{sub 4} synthesized by mechanical alloying and heat treatment.
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