Abstract:
Nanoferrites of the CoMn
xFe
(2–x)O
4 series (
x = 0.00, 0.05, 0.10, 0.15, 0.20) were synthesized in this study using the sol–gel auto-combustion approach. The lattice constants were computed within the range of 8.312–8.406 Å, while crystallite sizes were estimated to range between 55.20 and 31.40 nm using the Scherrer method. The different functional groups were found to correlate with various absorption bands using Fourier transform infrared (FTIR) spectroscopy. Five active modes were identified by Raman spectroscopy, revealing vibration modes of O
2− ions at tetrahedral and octahedral locations. The ferromagnetic hysteresis loop was observed in all the synthesized samples, which can be explained by Neel’s model. The results showed that AC conductivity decreased with increasing Mn
2+ content at the Fe
2+ site, while the dielectric constant and dielectric loss increased with increasing frequency. Furthermore, the saturation magnetization (
Ms), remnant magnetization (
Mr), and coercivity (
Hc) all showed declining trends with the increase in Mn
2+ doping. Finally, the CoMn
0.20Fe
1.8O
4 samples showed
Ms and
Mr values ranging from 73.12 to 66.84 emu/g and from 37.77 to 51.89 emu/g, respectively, while
Hc values ranged from 1939 to 1312 Oe, after which coercivity increased. Thus, the CoMn
0.20Fe
1.8O
4 sample can be considered a promising candidate for magnetic applications.