Magnetic Performance of Bi Architecture α-Fe2O3/NiFe2O4 Nanocomposite

Bi architecture Fe-based system shows the most extensive applications spawned from memory to optoelectronic device. With this line of understanding, we herein synthesized α-Fe2O3/NiBixFe2-xO4 (0 ≤ x ≤ 0.20) by sono-wave-driven wet chemical route. The grain size of the sample reduced with increasing Bi doping concentration even though the morphological features remain the same. The presence of α-Fe2O3 and NiFe2O4 phases in the XRD pattern confirms the formation of composite samples. Bi doping has a significant impact on controlling the phase fraction as well as magnetic properties of the nanocomposite. The nanocomposite with x = 0.20 showed a drastic reduction in saturation magnetization (more than 7 times) as compared to the un-doped sample. The alteration of coercivity and exchange bias in the nanocomposite with Bi doping is well correlated with the fraction of NiFe2O4 phase present in the corresponding sample. Moreover, Bi doping induces the deterioration in magnetic properties in the sample.