The Behaviour of Magnetic Properties and Electromagnetic Absorption of MgFe2O4 prepared by Powder Metallurgy Method

This study focuses on the behavior of magnetic properties and electromagnetic absorption of MgFe
2
O
4
prepared by powder metallurgy. Magnesium ferrite was synthesized using oxide precursors (MgO and Fe
2
O
3
). The samples were calcined at 700 °C for 3 hours and sintered at 1100 °C for 24 hours with varying compaction pressure (80 kg/cm
²
, 90 kg/cm
²
, 100 kg/cm
²
). Magnesium ferrites were characterized using an X-Ray Diffraction (XRD) for their crystal structure analysis, a Scanning Electron Microscope equipped with an Energy Dispersive Spectroscopy (SEM-EDS) for their microstructure and elemental composition studies, a Permagraph for their magnetic properties, and a Vector Network Analysis (VNA) for their microwave absorption characteristics. XRD patterns shows primary phase of MgFe
2
O
4
and secondary phase of Fe
2
O
3
present in all three samples. The SEM characterization reveal the microstructure of magnesium ferrite and the EDS spectra confirm the presence of Fe, Mg, and O. The hysteresis curves show that the values of remanence magnetic induction (Br) are 17.5 emu/g, 16.5 emu/g, and 14.5 emu/g, respective to the increasing compaction pressure. Saturation magnetization values are increasing whereas the coercivity values are found to have inconsistent change with increasing compaction pressure. According to VNA results, the values of reflection loss are -16.15 dB, -22.45 dB, and -27.55 dB, respectively.