Dielectric and microstructure behavior of LSMO: cobalt ferrite nanocomposite

Abstract

Manganite-ferrite nano composites are of interest due to its unusual magnetic and electrical properties. On the basis of technological importance, this nanocomposite can be used as magnetic tapes, sensing devices, read heads for hard disc & magnetic storage. In this work Microwave assisted synthesis was carried out for the preparation of (1-x) mol % La0.67Sr0.33MnO3 (LSMO): x mol % CoFe2O4 (CF) (where x= 0, 30, 50, 70 and 100) nanocomposites using kitchen microwave oven. The Dielectric properties such as relative permittivity, loss factor, impedance value of these composites were measured. By varying with sintering temperature and frequency, the change in dielectric properties and microstructural behaviour were observed. The relative permittivity values and loss factor were found to be decrease with increase in frequency. The loss factor value was found to be negative in case of 70LSMO:30CF nanocomposite. The impedance value was also found to be decrease with increase in frequency. But in case of 70LSMO:30CF, where the LSMO percentage is higher, it increases first and then it decreases