Abstract
Nanocomposites comprising of ferromagnetic (FM) α-Fe and antiferromagnetic (AFM) MnO, CoO and NiO have been synthesized by high-energy ball-milling for 30 h at 300 rpm speed. Powder X-ray diffraction and Rietveld refinement analysis are used for the microstructural analysis of the samples. Mossbauer spectroscopy shows different relaxation phenomena that indicate polydispersity nature of the samples. Magnetic hysteresis measurements confirm an enhancement in coercivity as well as exchange field. Irreversibility in temperature-dependent magnetization measurement points toward the formation of super-spin-glass-like state arising from wide size distribution of particles. This assumption is confirmed by field-cooled memory effect and temperature cycling in zero-field-cooled magnetization.
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