Investigation of chromium doping effect on the structural and magnetic properties of MnFe2-xCrxO4 ferrite nanoparticles

In this investigation, the manganese ferrite nanoparticles MnFe2-xCrxO4) x=0, 0.25, 0.5, 0.75) were prepared. Structural properties of samples were analyzed using X- ray diffraction and field emission scanning electron microscopy (FESEM). By evaluating XRD results, using Scherrer's equation, the size of the crystallites was obtained about 4 nm. FESEM images indicated agglomerated nanoparticles for samples. The magnetic properties have been characterized by using AC susceptometer and vibrating sample magnetometer (VSM). Given the results of VSM, the study found that the magnetization of nanoparticles decreased with increasing Cr doping. AC magnetic susceptibility of samples shows, the response of samples is dependent on the applied frequency. Results showed that the prepared samples at low temperatures indicate super spin–glass behavior with strong interaction between nanoparticles.