Surface and interparticle interactions effects on nano-cobalt ferrites

Abstract Cobalt ferrites nanoparticles Co x Fe 3-x O 4 (1≤ x  B ) range from 294 to 240 K. Kneller's law fitting of the coercive field dependence on the temperature exhibits a non-neglected interparticle interaction and a wide size distribution according to the difference found between T B and the Kneller transition temperature T BK .