Abstract
The AC susceptibility, zero-field-cooled and field-cooled magnetization, 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 presence of single-domain magnetic clusters. The temperature dependence of the magnetic hyperfine field in Mossbauer spectra indicates the absence of noncollinearity of spins even at low temperatures. The anomalous shapes of the Mossbauer spectra at higher temperatures have been found to result from the presence of ionic spin relaxation. The superparamagnetic fluctuations effect affects the Mossbauer spectrum above 260 K only.
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