Optical and Temperature-Dependent Magnetic Properties of Mn-Doped Cofe2o4 Nanostructures

Abstract

Understanding and untangling low-dimensional magnet materials are essential to implanting these materials for practical industrial applications. This work demonstrates how manganese doping can significantly advance cobalt ferrite's magnetic and optical characteristics. At first, we applied the hydrothermal approach to prepare stoichiometric cobalt ferrite nanostructures, followed by the manganese doping to acquire CoMnxFe2-xO4 (0 ≤ x ≤ 0.1) nanostructures. The fast Fourier transform infrared spectroscopy confirms the stretching/bending modes associated with the functional groups of spinel ferrites at different wavenumbers. The high-resolution transmission electron microscopy analysis further confirms the crystalline structure of manganese-doped cobalt ferrite. The room temperature magnetic measurements investigate that the magnetic coercivity is maximum for CoMn0.2Fe1.8O4 nanostructures. The low-temperature magnetic characteristics agree with Bloch's law and Kneller's law for saturation magnetization and coercivity of CoMn0.2Fe1.8O4 nanostructures. The optical properties confirm a blueshift and slight increment in bandgap energy of manganese-doped cobalt ferrite nanostructures.

Keywords: Spinel Ferrite, hydrothermal method, Low-temperature magnetism, bandgap