Magnetic aftereffects in magnesium ferrites

We report a study of aftereffect processes in magnetite with magnesium substitutions. The study observed the processes by means of disaccommodation techniques. We have recorded the time evolution of the initial magnetic susceptibility after sample demagnetization of polycrystalline specimens with nominal composition Mg/sub x/Fe/sub 3-x/O/sub 4/, 0/spl les//spl times//spl les/1 in the temperature range from 200 K to 500 K. We find that magnesium substitutions reveal interesting results about magnetic aftereffects in oxide spinels.