INTRAPARTICLE STRUCTURE IN ULTRA-FINE ZNFE2O4 PARTICLES

We have performed small-angle polarized-neutron scattering from ultra- fine ZnFe2O4 particles to confirm the intraparticle magnetic structure , which has been considered the origin of its peculiar magnetic featur es. On the basis of the Q-dependent differential neutron-scattering in tensity, we were unable to detect any magnetic structure consisting of magnetically inactive surface layer with magnetic core. Thus, the mag netic behavior of ultra-fine ZnFe2O4 particles is explained in terms o f a deviation in cation distribution from the normal spinel structure.