MAGNETIZATION AND MOSSBAUER STUDIES OF ZN0.5CO0.9FE1.2TI0.4O4

The AC susceptibility, zero-field-cooled and field-cooled magnetizatio n, hysteresis and Mossbauer studies in the temperature range of 4.2 to 300 K of Zn0.5Co0.9Fe1.2Ti0.4O4 are reported. The observed peak in AC susceptibility, the temperature irreversibility in magnetization and the change in coercivity with temperature are shown to be due to the p resence of single-domain magnetic clusters. The temperature dependence of the magnetic hyperfine field in Mossbauer spectra indicates the ab sence of noncollinearity of spins even at low temperatures. The anomal ous shapes of the Mossbauer spectra at higher temperatures have been f ound to result from the presence of ionic spin relaxation. The superpa ramagnetic fluctuations effect affects the Mossbauer spectrum above 26 0 K only.