Abstract
•Synthesis of single phase Ni0.5Co0.5Fe2O4 nano-ferrites by using sol-gel technique.•Study of irreversible magnetic behavior with variable temperature and determination of micro-strain, retentivity and coercivity.•Demonstration of crystallite into cubic structure under spinel group by Rietveld refinement.•Determination of blocking temperature using Kneller’s law.•Saturation magnetization at different temperature follows Bloch’s law.
In this paper, the irreversible magnetic behavior of Ni0.5Co0.5Fe2O4 nano-ferrite has been discussed with varying the temperature. The nano-ferrite discussed in present work synthesized using sol gel technique. The formation of the phase of Ni0.5Co0.5Fe2O4 was confirmed using X-ray diffraction (XRD), and their Rietveld refinement shows it crystallized into cubic structure with lattice constant 8.3541 Å under space groupFd3-m. The homogeneity and the morphology of the sample was analysed using FESEM along with EDAX measurement. The irreversibility of Ni0.5Co0.5Fe2O4 was studied in three modes ZFCW, FCC and FCW using field dependent magnetic measurements in temperature range of 2 K–300 K under the presence of 50 Oe. However, the magnetic hysteresis of sample was studied at different temperature T = 5 K, 50 K, 100 K, 120 K, 200 K, 300 K from varying the field upto ±5 Tesla. Further, the asymmetry observed in the magnetization and demagnetization curve gives the value of Hm, which increased with lowering the temperature due to magnetic crystalline phase as well as the micro-strain of the sample. Finally, retentivity, coercivity and saturation magnetization of the present sample makes it a potential candidate for magnetic memory devices, magnetic resonance imaging, medical diagnosis applications.