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Mn0.25Fe2.75O4 nanoparticles have been successfully synthesized using the coprecipitation method. The nanoparticles are the basic components in the fabrication of Mn0.25Fe2.75O4/Ag composites which have been synthesized using the chemical reduction method. To investigate the nanostructure, morphology, functional group, and specific absorption rate (SAR) value of Mn0.25Fe2.75O4 nanoparticles and Mn0.25Fe2.75O4/Ag composites, material has been characterized using XRD, TEM, FTIR, and magneto-thermal instruments respectively. The XRD pattern showed that Mn had been successfully substituted well in the Mn0.25Fe2.75O4 nanoparticles indicated by the shift of diffraction peak towards the smaller angle of 2θ. Through Rietica analysis, the crystal sizes of Mn0.25Fe2.75O4 and Ag nanoparticles were 5.40 nm and 8.05 nm respectively. This result was confirmed well by TEM characteristics which showed that the average size of Mn0.25Fe2.75O4 and Ag particles as much as 5.03 nm and 8.74 nm respectively. The success of Ag nanoparticle in Mn0.25Fe2.75O4/Ag composites was from the distribution of Fe-O and amine functional groups which were the representation of Mn0.25Fe2.75O4 and Ag nanoparticles. Furthermore, Ag nanoparticles were relatively effective in increasing the SAR value of Mn0.25Fe2.75O4/Ag composites of 0.19 W/g (without Ag) into 0.21 W/g (with 0.2 g Ag).

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The Fe2.75Mn0.25O4 nanoparticles were successfully synthesized by using the coprecipitation method, while the Fe2.75Mn0.25O4@PANI materials were successfully fabricated by using the in situ polymerization method. This research aimed to investigate the magnetic properties and nanostructure of the Fe2.75Mn0.25O4 nanoparticles and Fe2.75Mn0.25O4@PANI materials. Some characterizations of the samples were successfully carried out by using X-Ray Diffraction (XRD) instruments, Fourier Transform Infrared (FTIR), and Vibrating Sample Magnetometer (VSM) each of which was conducted to characterize the crystal structure, functional groups, morphology, and the magnetic properties of the materials. The XRD analysis results showed that the Fe2.75Mn0.25O4@PANI materials had a crystal size of 8.09 nm. Meanwhile, the FTIR spectrum represented vibrations due to the atomic bonds that made up the Fe2.75Mn0.25O4@PANI materials. Furthermore, the hysteresis curve from the VSM characterization results showed that the Fe2.75Mn0.25O4@PANI material saturation magnetization value was around 2.85 emus/g. From those characterization results, the Fe2.75Mn0.25O4@PANI materials are very potential to be applied as magnetic ink

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