Abstract
The present work undertakes an investigation of magnetic memory effect in Dy-0.5(Sr1 - xCax)(0.5)MnO3 (x = 0 and x = 0.3) nanoparticles heated at 700 degrees C and 1350 degrees C. Zero-field-cooled (ZFC) and field-cooled (FC) magnetization measurements displayed the existence of magnetic memory effect in only samples with a Ca concentration x = 0.3. However, there is no sign of magnetic memory in samples with x = 0 of Ca amount. This confirms that the effect of substituting the Sr by Ca on the appearance of magnetic memory is of great importance, admitting that magnetic memory is mainly due to the powerful inter-particle interactions.