Abstract
Effect of Fe concentration in forming NiO/NiFe2O4/α-Fe2O3 nanocomposite (NC) was probed through structural and magnetic characterizations. Presence of two-magnon mode in Raman spectra confirms the existence of NiFe2O4 and α-Fe2O3 phases in the background of antiferromagnetic (AFM) NiO matrix. Magnetic study further confirms the occurrence of weak ferromagnetism in the AFM background. The behaviour of temperature dependence of saturation magnetization revealed that the samples exhibit some type of inhomogeneity. The NC samples show robust exchange bias characteristics at room temperature. The occurrence of ferromagnetic like feature in the NC samples could be due to the combine effect of the formation of BMP along with the magnetic inhomogeneity. The samples show the persistence of robust exchange bias field at 300K. The amplification of anisotropic constant with higher Fe concentration in the NC sample could be ideal for device applications like magnetic recording media.
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