Abstract
Linear and non-linear dynamic properties of a re-entrant ferromagnetic polycrystalline bulkLa0.85Ca0.15Mn0.95Fe0.05O3 sample are studied using AC susceptibility. This sample composition shows a transitionfrom paramagnetic (PM) to ferromagnetic (FM) at around 174 K and to spin glass (SG) at∼100 K. The dynamic behaviour is investigated in the intermediate temperature range(Tg<T<Tc). A prominent non-linear susceptibility is observed in this range, signifying thedecomposition of the FM network into clusters by a random magnetic field which isexpected to be generated by PM spins in the FM region. The results are supported by astudy of the AC frequency and DC field effect on the non-linear susceptibility.
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