Abstract
M-type hexaferrites with Co2+ and Ni2+ ions substituting for Fe(3+ )ions (Ca0.30Sr0.35La0.35Fe12.0-x(Co0.5Ni0.5)(x)O-0.19, 0.0 <= x <= 1.0) were prepared by the traditional solid state method. X-ray diffractometer (XRD), field emission scanning electron microscopy (FE-SEM), physical property measurement system-vibrating sample magnetometer (PPMS-VSM) have been employed to study the microstructures and magnetic properties of hexaferrites. XRD patterns showed that the single magnetoplumbite phase is obtained if Co-Ni content (x) <= 0.4 and impurity phases are observed in the structure when Co-Ni content (x) >= 0.4. FE-SEM micrographs showed that the hexaferrites with hexagonal platelet-like grains is obtained. The saturation magnetization (M-s), remanent magnetization (M-r), M-r/M-s ratio, magneton number (n(B)), coercivity (H-c), magnetic anisotropy field (H-a) and first anisotropy constant (K-1) decrease with increasing Co-Ni content (x) from 0.0 to 1.0. And our reported results with tunable H-r and M-r can be used for recording applications.