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Hysteresis loops M(H) for Fe3O4 (black) and γ-Fe2O3 (red) and γ-Fe2O3@NGO (blue) nanoparticles. The insets show the Zero-field cooled (black) and field-cooled (orange) magnetization curves for Fe3O4, γ-Fe2O3, and γ-Fe2O3@NGO, taken with HFC = 100 Oe.
