LAUSR

Abstract M-type permanent magnetic ferrites Sr 0.95− x Y 0.05 La x Fe 11.75 Co 0.25 O 19 ( x  = 0.00, 0.10, 0.20, 0.30, 0.40) have been prepared by ceramic process and investigated systematically. The phase compositions were examined by X-ray diffraction, the results showed that the single phase was obtained when x  ≤ 0.30. The morphology of the magnets was investigated by scanning electron microscopy (SEM), the micro-morphology of the particles exhibited the uniform plane hexagonal structure with different lanthanum content. Magnetic properties of the sample were measured by a physical property measurement system-vibrating sample magnetometer (PPMS-VSM). The saturation magnetization ( M s ) decreases constantly with the increasing of La content ( x ). However, the coercivity ( H c ) increases as the increasing of doping content.