Cohyphen;doped ferrite single domains and the effect of metallic nanoinclusions

摘要

Magnetic properties measurements were performed on metalndash;ferrite composites prepared by coprecipitation of Co and Fe chlorides at various Co/Fe ratios. The microstructure can be described as octahedrally shaped ferrite particles with nanometric CoFe alloy inclusions. Upon elimination of the metallic fraction, and increase in coercive fieldHcand a decrease in saturation magnetizationMswere observed. Scanning electron microscopy observations revealed that ferrite particles were in micron range, with a narrow size distribution. The composite magnetic properties can be interpreted in terms of a nanostructured exchangedhyphen;coupled system, while the ferritehyphen;only magnetic behavior is close to a singlehyphen;domain, Stonerndash;Wohlfarth system. copy;1996 American Institute of Physics.