Analysis of Optical and Magnetic study of Silver substituted SrW hexagonal ferrites

Nanocrystalline particles of strontium W-type hexaferrites having chemical composition SrCo2AgxFe16-xO27 (x = 0.0, 0.1, 0.2, 0.3) were synthesized by sol-gel technique. The optical and magnetic study was done by using Fourier transform infrared spectroscopy (FTIR) and vibrating sample magnetometer (VSM). The FTIR spectra consisting of absorption peaks within range of 603.9-607 cm(-1) confirmed the formation of hexagonal structure for the prepared samples. From the magnetic hysteresis loops, the four magnetic parameters such as saturation magnetization (M-s), remanent magnetization (M-r), coercivity (H-c) and magnetic moment (n(B)) were calculated. It was reported that saturation magnetization (Ms) and magnetic moment (n(B)) increases for lower values of silver dopant (x = 0.0, 0.1, 0.2) but for the highest concentration of silver (x = 0.3), values of these two parameters decreases. Also, the values of coercivity (H-c) were found to be in range of 6-54 Oe indicating soft character of synthesized nanohexaferrites.