Title : Interdependence of morphological electrical and magnetic properties of cu-substituted ni-zn-mg nano-crystalline ferrite
Ferrites having chemical formula, Ni0.5-xCuxZn0.3Mg0.2Fe2O4 with x = 0, 0.1, 0.2, 0.3, 0.4 and 0.5 have been prepared by auto-combustion route. Field emission scanning electron microscopy (FE-SEM) micrographs show that samples have nano-crystalline behavior and show spherical shape. Selected area electron diffraction (SAD) patterns confirm the spinel structure of the ferrite. Transmission electron microscopy (TEM) images show a well defined nano-crystallite state with an average particle size of around 28 to 39 nm. The electric properties have been studied by means of DC electrical resistivity. The increase in AC conductivity is observed with increase in Cu-content, indicates dispersion with frequency at room temperature. The magnetic hysteresis were done using vibrating sample magnetometer (VSM) which show that saturation magnetization (Ms), remanent magnetization (Mr) and coercivity (Hc) decrease with increasing Cu-content exhibiting super paramagnetism characteristic at room temperature. The frequency dependence initial permeability was studied in the range of 100Hz to 5MHz. This shows high frequency stability after dispersion occurred. The graph of magnetic loss tan (δμ/μi) supports dispersion. Variation of loss tan (δμ/μi) against frequency exhibit resonating behavior.
Keywords: Spinel ferrites; DC resistivity; AC conductivity; M-H loop; Initial Permeability.
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- Ferrite nano-particles (FNPs) belong to a broad group of magnetic nano-particles (MNPs) and have received a considerable amount of attention due to their wide applications in various fields, which ranges from biomedical to industrial
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