Magnetic properties and hyperthermia action of cobalt zinc ferrite fibers

Zinc ion substituted cobalt ferrite fibers (Co 1-x Zn x Fe 2 O 4, for x = 0.1, 0.2, 0.3, 0.4, and 0.5) have been synthesized by using the electrospinning technique. The fiber was annealed at 800 °C temperature to study its effect on the magnetic properties and hyperthermia action. Its crystal structure has been studied by the analysis of X-ray Diffraction (XRD) pattern. It crystalizes to Fd 3 ¯ m space group. The crystal structure analysis has been performed by employing Rietveld refinement analysis of XRD pattern. The Field Emission Scanning Electron Microscopy (FE-SEM) and Transmission Electron Microscopy (TEM) study have been carried out to explore the microstructure and morphology of the fiber. The magnetic properties of fiber have been modified by the zinc ion substitution at the cobalt site. The magnetocrystalline anisotropy properties have been studied by using the Law of Approach to Saturation Magnetization. The magnetocrystalline anisotropy constnt and saturation magnetization decrease with the increase of zinc ion percentage in cobalt ferrite. The hyperthermia effect of cobalt zinc ferrite fiber with its magnetocrystalline anisotropy has been explored. The Specific Absorption Rate (SAR) and Intrinsic power loss (ILP) parameters have been determined to explore the heating effect of magnetic fibers. The SAR and ILP values are varying from 295 to 725 W/g and 1.16–10.69 nHm 2 /kg, respectively, for different substitutions of zinc ion. Graphical abstract Highlights Fabrication of zinc substituted cobalt ferrite fiber by electrospinning method. Magnetic anisotropy study by Law of Approach to Saturation magnetization. Hyperthermia study of zinc substituted cobalt ferrite fiber. Linear response theory and Box-Lucas model has been used for SAR calculation.