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Figure 3 Magnetic properties of different compositions of iron and iron carbide based nanoparticles. (a) Magnetization data of ~9.6 nm iron(0) nanocrystals at 2 and 300 K. (b) Magnetization data analysis of ~13.1 nm MM2 at 2 and 300 K. (c) Magnetization data analysis of ~14.2 nm MM1 nanocrystals at 2 and 300 K. (d) Stability against oxidation of iron, MM1, and MM2 nanocrystals.