Study of Structural, Dielectric and Magnetic Properties of MFe2O4 (M=Ni, Co) Spinel Ferrites

Abstract

Spinel ferrites NiFe2O4 (NFO) and CoFe2O4 (CFO) were
synthesized by conventional solid-state reaction method. Structural analysis
of these ferrites was studied by recording XRD at room temperature.
Rietveld refinement of XRD patterns confirms the presence of single-phase
cubic symmetry (Fd3m) of both the samples without the presence of any
secondary phase. The dielectric constant ( ' ) and dielectric loss (tan )
were studied in the frequency range (100Hz to 7MHz) at different
temperatures. The complex impedance spectroscopy was studied to find the
impact of grains and grain boundaries in ferrites. The magnetic
characterization was determined by M-H hysteresis loop which reveals the
ferromagnetic behavior of spinel ferrites.