Study on preparation and magnetic properties of Sr1-xGdxFe12-xCuxO19 (0.00 x 0.20) strontium ferrite prepared by solid phase method

M-type strontium ferrites (Sr1-xGdxFe12-xCuxO19, x = 0.00, 0.05, 0.10, 0.15 and 0.20) doped with equivalent ions were synthesized via the solid phase method. The crystallographic structure, morphology and magnetic properties of samples were investigated using x-ray diffractometry (XRD), scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM), respectively. The XRD results show that the pure M-type phase is successfully obtained when the Gd-Cu substitution amount x below 0.20. When the doping content is low, the typical hexagonal block structure appears in the magnet. When x is 0.05, the saturation magnetization (Ms), remanent magnetism (Mr) and coercivity (Hc) reach the maximum values of 51.25 emu/g, 565.50Oe and 27.67 emu/g, respectively.