EFFECT OF COBALT ON THE PROPERTIES OF LITHIUM-CONTAINING FERRITE MATERIALS

The interdependence of the magnetic aftereffect with ferrite compositi on and heat treatment schedule is analyzed. It is found that an aftere ffect develops in cobalt-containing materials as a result of the spine l component Co3O4 which forms in solid solutions. This component disru pts the homogeneity of the solution under slow cooling conditions belo w 1100 K. The influence of cobalt on hysteresis loop parameters increa ses when a distant order develops in the ferrite: the structure itself does not cause a magnetic aftereffect. In order to prepare materials resistant to the magnetic aftereffect with high-temperature stability of magnetic parameters it is necessary to use systems with a wide rang e of composition homogeneity and to avoid slow cooling within the rang e 1100-293 K.