Seung-li Choi

Magnetic Properties of Cr-Doped Inverse Spinel Fe 3 O 4 Thin Films

By substituting Cr in inverse-spinel thin film samples were prepared by sol-gel spin-coating method and their structural electronic, and magnetic properties were analyzed. X-ray diffraction indicates that the lattice constant decrease with increasing Cr composition (x). This result can be explained in terms of occupation of octahedral sites by ions with smaller ionic radius than that of Vibrating sample magnetometry measurements on the samples at room temperature revealed that saturation magnetization () decrease by Cr substitution, explainable by comparing spin magnetic moment among the related transition-metal ions. A decrease of magnetoresistence effect with x was observed, similar to that of . The coercivity of the films was found to increase with x, attributed to the increase of magnetic anisotropy by the existence of octahedral .

Effects of Vanadium Doping on Magnetic Properties of Inverse Spinel Fe 3 O 4 Thin Films

Effects of V substitution of Fe on the magnetic properties of have been investigated by x-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), conversion electron Mossbauer spectroscopy (CEMS), and vibrating sample magnetometry (VSM) measurements on sol-gel-grown films. XRD data indicates that the films maintain cubic structure up to x