SAIP2026

Hydrothermal fabrication and temperature-dependent magnetic properties of cobalt nanoferrite for high-frequency devices

8 Jul 2026, 16:20

1h 20m

Great Hall ( University of the Western Cape)

Poster Presentation Track A - Physics of Condensed Matter and Materials Poster Session 2

Speaker

Dr Amos Nhlapo (Sefako Makgatho Health Sciences University)

Description

The cobalt nanoferrite with crystallite of 12.89nm was successfully synthesized using the hydrothermal method. The X-ray diffraction (XRD) and the Fourier transform infrared spectroscopy (FTIR) confirmed the formation spinel structure. The obtained lattice parameter was 8.36 Å while the X-ray densities was 5.021 g/cm³. The scanning electron microscopy (SEM) revealed spherically shaped and agglomerated nano-particles. The “S” shaped hysteresis loops revealed ferromagnetic magnetic properties. The saturation magnetization increased with decreasing measuring temperatures following the Kneller’s Law, from 6.622 emu/g to 9.793emu/g. The evolution of coercive fields (HC) upon reducing the measuring temperature from room temperature (300K) to 4K indicates the thermal instability of the blocked magnetic moments. The HC values increased with decreasing measuring temperature according to Bloch’s Law. Relatively high coercive fields at low temperatures make the material suitable for application in transformers and high-frequency devices. The FC and ZFC magnetization revealed the blocking temperature 210K.