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Over the past two decades, there has been a notable increase in research focused on nanomaterials, particularly ferrite nanoparticles. Research interest in spinel ferrite magnetic nanoparticles has surged in recent years, driven by their potential applications in antennas, transformer, spintronics, biomedical fields, and catalysis. In our study, bare cobalt ferrite and Li+-Zn2+ co-doped cobalt ferrite nanoparticles (CoLi0.3Mn0.3Fe1.4O4) were synthesized using a co-precipitation approach both without surfactants and in the presence of three different surfactants, including cetyltrimethyl ammonium bromide (CTAB), polyvinyl pyrrolidone (PVP), and polyethylene glycol (PEG). The influence of various surfactants on the formation of crystal structure, morphology, magnetic and dielectric properties was investigated through X-ray diffraction (XRD), Scanning electron microscopy (SEM), vibrating sample magnetometer (VSM), and dielectric measurements. The XRD findings revealed the pure crystalline nature of synthesized samples with no impurity. The SEM micrographs revealed that sample coated with PVP is more uniform. The Energy Dispersive X-ray (EDX) analysis confirmed that the elemental composition was relevant with the expected values for the co-precipitation route.
The type of surfactant used as a template influenced the magnetic properties of the synthesized cobalt ferrite nanoparticles by affecting their geometry. The presence of surfactants reduces the size of ferrite nanoparticles, leading to decreased coercivity and a significant enhancement in saturation magnetization, making it a suitable candidate for various applications. The dielectric loss of the synthesized nanoparticles significantly decreased, making the material suitable for high-frequency applications. The current findings indicate that the addition of various surfactants during sample preparation significantly controls the size of CoLi0.3Mn0.3Fe1.4O4 nanoparticles, which in turn has a noticeable impact on the magnetic properties of the material.
