Abstract
Linear and non-linear dynamic properties of a re-entrant ferromagnetic polycrystalline bulk La0.85Ca0.15Mn0.95Fe0.05O3 sample are studied using AC susceptibility. The Fe doped La0.85Ca0.15Mn0.95Fe0.05O3 undergoes a ferromagnetic transition at TC = 174 K and to spin glass (SG) at Tg∼100 K, and a decrease in the AC susceptibility as well as zero-field-cooled (ZFC) magnetization measured using very low DC magnetic fields. The dynamic behavior is investigated in the intermediate temperature range (Tg<T<TC). A prominent non-linear susceptibility is observed in this range, signifying the decomposition of the FM network into clusters by a random magnetic field which is expected to be generated by PM spins in the FM region. The results are supported by a study of the AC frequency and DC field effect on the non-linear susceptibility.
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