Tailoring magnetic properties of SrFe12O19 ferrites through Dy–Ni Co-substitution: A comprehensive study

A solid-phase synthesis method was utilized to create a range of ferrite samples, specifically Sr 1- x Dy x Fe 12- x Ni x O 19 , where x values varied (0, 0.01, 0.02, 0.03, and 0.05). Through X-ray diffraction (XRD) analysis, it was found that up to x  ≤ 0.03, the XRD pattern showed no discernible impurity phases. However, at x  = 0.05, an observable impurity peak attributed to α-Fe 2 O 3 emerged. Room temperature hysteresis loop measurements revealed consistent hard magnetic behavior across all samples. Notably, changes in coercive force directly correlated with magnetocrystalline anisotropy. As substitution increased, the initial saturation magnetization ( M S ) of 59.68 emu/g (at x  = 0.00) moderately reduced to 57.79 emu/g (at x  = 0.05), representing a modest decline of 3.17 %. A clear trend was observed: decreasing grain size led to diminishing dielectric constants. Moreover, a strong link between the Nyquist diagram's semicircle diameter and sample resistivity was evident, showing distinctive metal-semiconductor behavior. These findings shed light on the structural and magnetic characteristics of Dy and Ni co-substituted SrFe 12 O 19 ferrites, suggesting potential for enhanced performance in advanced magnetic and electronic devices. This study significantly contributes to the field of ferrite materials, deepening our insights and paving the way for innovative applications in diverse technological domains.