Magnetic and electromagnetic properties of Pr doped strontium ferrite/polyaniline composite film

This paper reported three acid (including hydrochloric acid HCl, p-toluenesulfonic acid PTS and D-camphor-10-acid CSA) doped SrPr _0.2Fe_11.8O₁₉/PANI composite film and the HCl-PANI film prepared by a sol-gel method and in-situ oxidative polymerization. The characteristics of the film phase structure, surface morphology, conductivity and magnetic and electromagnetic properties were studied by using XRD, XPS, FESEM, four-probe tester, VSM and Vector Network Analyzer. The resistivity of organic acid doped composite films is higher than that of the HCl doped one. The saturation and remanent magnetization of PTS and HCl doped composite films are greater than the CSA-doped one; however, the coercivity of the three acid doped composite films is basically 5546 Oe. The saturation magnetization, remanent magnetization and coercivity of SrPr _0.2Fe_11.8O₁₉ film are greater than those of the SrPr_0.2Fe_11.8O₁₉-PANI composite film. In the frequency range of 8-12 GHz, the dielectric loss of HCl-PANI film is the maximum, and the dielectric loss of SrPr_0.2Fe_11.8O ₁₉ film is the minimum; the magnetic loss of the four films is in descending order as SrPr_0.2Fe_11.8O₁₉ film, PrSrM/(HCl-PANI) composite film, PrSrM/(CSA-PANI) and HCl-PANI film.