MAGNETIC-PROPERTIES OF ULTRAFINE PARTICLES AND BULK MATERIAL OF CADMIUM FERRITE

We studied the magnetic properties of ultrafine cadmium ferrite partic les that had been prepared by the coprecipitation method and bulk mate rial by the generally used ceramic method. The ultrafine particles sho wed ferromagnetic behavior, while the bulk material had no spontaneous magnetization. We evaluated a large anisotropy constant K (3.6 x 10(6 ) erg/cm(3)) in the ultrafine cadmium ferrite particles. The enhanced magnetic nature of the ultrafine particles can be explained based on a n idea of cluster formation which is relevant to cation distribution. (C) 1998 Elsevier Science B.V. All rights reserved.