MULTIFERROICS – PREPARATION METHOD AND PHYSICAL PROPERTIES

Polycrystalline Ba0.5Sr1.5MgNiFe11Al1O22 powder materials were synthesized by modified citric acid - assisted sol - gel auto - combustion method. To enhance its crystallinity and phase purity, the material was sintered at 1190°C in air for five hours under ambient atmospheric conditions. The structural and magnetic properties of the prepared samples were evaluated by various techniques in view of understanding the correlations between their functional properties and crystal structure. Further, the magnetic measurement performed showed a decrease in the blocking temperature when the strength of the external magnetic field was increased. Such behavior indicates the presence of a spin - frozen or a spin - glass - like state, which we observed for the first time in this type of composite samples.