An assessment of electromagnetic properties of substituted hexaferrite/SWCNTs nanocomposite

Abstract SrZn2-x(MnCa)x/2Fe16O27(x = 0–0.6) nanoparticles synthesized by Co-precipitation method and single walled carbon nanotube (SWCNTs) were used to prepared microwave absorption nanocomposite. X-ray diffractometry (XRD), scanning electron microscopy (SEM), Fourier-transform infrared (FT-IR) spectroscopy, vibrating sample magnetometry (VSM), and vector network analyzer (VNA) were utilized to characteriziation of samples. The results showed that the particle size of Zn2W hexaferrite varies in the range of 55–75 nm with a good hexagonal shape. Structural changes due to the addition of divalent cations change the magnetization (M) and coercivity (Hc) of samples. The highest magnetization and coercivity are obtained in the sample containing x = 0.4 (M = 70 emu/g) and the nanocomposite sample (Hc = 605 Oe), respectively. Based on reflectivity measurement, the nanocomposite sample contains nanoparticles of hexaferrite with x = 0.4 and SWCNTs showed a maximum reflection loss of −42 dB at the frequency of 10.2 GHz. This sample also covers the entire x bandwidth (4 GHz) less than −10 dB and 1.5 GHz less than −20 dB.