Fascinating study of adding nanocomposite cobalt nano ferrite to silver nanoparticles accompanied magnetite impurity

The nanomaterials silver nanoparticles accompanied magnetite impurity (Ag–Fe 3 O 4 ) (AF) and cobalt nano ferrite/silver–magnetite (0.3 CoFe 2 O 4 /0.7Ag–Fe 3 O 4 ) (CAF) nanocomposite were prepared by flash auto-combustion using urea as fuel. This is the first time preparing this new nanocomposite material. The as-prepared nanomaterials were characterized by X-ray diffraction pattern, atomic force microscopy, and Fourier transform infrared spectroscopy. This characterization affirmed that the nanoparticles were prepared in the nanoscale range with a cubic structure. The saturation magnetization of the CAF nanocomposite is 29-fold that of AF nanoparticles, and the coercivity of CAF is 19-fold that of AF. Moreover, a transformation from a soft hysteresis loop (AF) to a hard hysteresis loop for the CAF nanoscale makes CAF nanocomposite suitable for many technological applications, especially in a permanent magnet. Also, magnetic measurements showed that the operating frequency value of AF nanoparticles is very high in the radio wave region, and that of the CAF nanocomposite is an ultra-high frequency in the microwave S-band region. Unexpected behavior appeared for the antimicrobial activity of CAF nanocomposite. It was found that AF nanoparticles gave strong antimicrobial efficacy than CAF nanocomposite against the tested gram-positive and gram-negative bacteria. Thus, the AF and CAF nanomaterials are promising for many technological applications, especially biomedical ones for AF nanoparticles and a permanent magnet for CAF nanocomposite.