A Study of Co Substituted Mn-Ferrite, Mn$_{1 - x}$Co$_{x}$Fe$_{2}$O $_{4}$ ( ${x}=0.0, 0.5, 1.0$)

The Mn
_1-

x
Co
x
Fe
₂
O
₄
(
x
=0.0, 0.5, 1.0) materials were prepared by the high-temperature thermal decomposition method and studied for its unique magnetic phenomena of magnetic nanoparticles. The crystal structure is found to be an inverse cubic spinel with a space group of
Fd
-3
m
and the lattice constants (
a

₀
) of 8.432, 8.486, and 8.466 Aring , respectively. The samples show magnetization (
Ms
) of 54.2, 29.4, and 46.9 emu/g, respectively. Also, the coercivities (
Hc
) of all samples are 32.4, 86.9, and 90.7 Oe, respectively. Mossbauer spectra of all samples were obtained at various temperatures. Mossbauer spectra show a ferrimagnetic state of six-line having the hyperfine field (
Hhf
) values of 456, 472, and 475 kOe for the tetrahedral sites and 400, 422, and 430 kOe for the octahedral sites, respectively, which increases with doping Co concentration.