HIGH CURIE TEMPERATURE OF NANOSIZED NiZn FERRITE PARTICLES SYNTHESIZED BY A COMBUSTION METHOD

摘要

The magnetic properties of nanocrystalline powders of Ni{sub}0.5Zn{sub}0.5Fe{sub}2O{sub}4, synthesized at low temperatures, by a combustion method, have been investigated. Different powders containing crystallites of comparable average size, obtained by varying the synthesis conditions, show a large difference in the super-paramagnetic blocking temperature due to the wide difference in the size distribution. The ferrite nanoparticles show large Curie temperature enhancement up to ～100 K, when compared to that of the bulk.