Influence of samarium substitution on the structural and magnetic properties of M-type hexagonal ferrites

The M-type hexagonal ferrites with chemical formula SrFe12-xSmxO19 (x = 0, 0.01, 0.02, 0.03) were synthesized via sol-gel method. We studied the effects of substitution of rare earth on the structural and magnetic temperament of M-type hexaferrites. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) strategies are employed for the systematical examination of micrographs and structures of the samples. The magnetic particularities are studied by the use of vibrating sample magnetometery. The M-H loops are used to investigate the hard magnetic behavior of all the samples. The substantial value of coercivity (> 1 kOe) for all the samples shows that the particular sample is permanent magnet and reveals the hard magnetic action. It is observed that values of saturation magnetization (Mr) and remanence (M-s) decline with increasing the rare earth ions substitution. This decrease may follow spin canting and the magnetic dilution, which results in dislocation of superexchange interactions. The improvement in H-c may be because of large anisotropy of magnetocrystalline, where ion anisotropy of Fe2+ ion on the 2a site probably overriding in all hexaferrites series. The synthesized composites were useful for applications in magnetic microwave absorbing materials. (C) 2017 Elsevier B.V. All rights reserved.