Structural and Magnetic Properties of Zn Doped CoFe₂O₄

Abstract

Zinc doped cobalt ferrite powders were prepared by the solid state reaction method. The effect of zinc substitution on structure, morphology and magnetic properties was investigated. The X-ray analysis confirmed existence of the single phase cubic spinel structure, while Rietveld refinement data showed increasing of lattice parameters with zinc content. In addition, saturated magnetization increased with increasing zinc concentration and it was contained at maximum in CoFe_1.9Zn_0.1O₄ powders. However, the value of coercivity was decreased with zinc doped content. Furthermore, the oxidative states were characterized by X-ray absorption spectroscopy. The results confirm that the structure contained Co²⁺, Fe³⁺ and Zn²⁺ ions.

Keywords:

• Cobalt ferrite
• zinc doping
• magnetic properties
• XANES spectra

Acknowledgments

This work has been fully supported by research fund from KMITL research Fund. This research is also partly supported by grants from the National Research Council of Thailand (NRCT), National Nanotechnology Center (NANOTEC) NSTDA, through its Center of Excellence Network, and the Thailand Research Fund (Grant No. BRG5680006). R. Roongtao would like to acknowledge the Ph.D. scholarship provided by Synchrotron Light Research Institute (Public Organization). The authors would like to thank Department of Physics, Kasetsart University (KU) for VSM measurement.