Properties of chromium doping on structural and magnetic behavior of calcium nano-hexaferrites

The comparative study of substituted calcium hexaferrites samples with chemical composition CaCrxFe12-xO19 where x = 0, 2, 4, 6, 8, 10 and 12 have been chosen for the studies on structural and magnetic properties. Structural and Morphological properties are studied by X-ray diffraction technique (XRD) and Scanning Electron Microscopy (SEM). The XRD pattern confirmed that the formation of mono phase hexagonal ferrites with space group P63/mmc167: R-3c. The SEM results shows the sample exhibit relatively well defined hexagonal like grains with average particle size found in between 24 and 30 nm. Magnetic characterization of the samples is carried out using Vibrating Sample Magnetometer (VSM). The saturation magnetization (Ms), Remanence (Mr) and Coercivity (Hc) found to decrease with increase in the value of substitution which is attributed to the occupation of sub lattice spin-up and spin-down sites by diamagnetic ions and anisotropy. The samples have a better signal-to-noise ratio, as the particle size was less than 50 nm, when calculated by Debye-Scherer formula and may be suitable for recording media. (C) 2020 Elsevier Ltd. All rights reserved.