Title: Effect of Sm3+ substitution on structural and magnetic investigation of nano sized Mn–Sm–Zn ferrites
Abstract: Nano size Mn0.4Zn0.6SmxFe2−xO4 (x = 0.00, 0.01, 0.02, 0.03, 0.04, and 0.05) ferrites were prepared by solution combustion method. The structural and magnetic properties of samples were characterised by X-ray diffractometer, Fourier transform infrared spectrometer, transmission electron micrographs and magnetic properties at room temperature. The X-ray diffraction patterns and two prominent absorption bands in the frequency range 375–589 cm−1 confirmed the single phase with spinel cubic structure. The average nano crystallite sizes were in best agreements with transmission electron microscope images. Magnetic studies revealed the narrow hysteresis loops of ferrimagnetic nature at room temperature. The values of saturation magnetization (M s ), remanence magnetization (M r ), coercivity (H c ), remanence ratio (M r /M s ), magneton number, anisotropy constant and Yaffet–Kittle angle decreased with the increase in Sm3+ ion concentration was attributed to relative number of ferric ions on the tetrahedral sites diminished and reduced the Sm–Fe interaction.