Synthesis of Carbon Encapsulated Mono- and Multi-Iron Nanoparticles

Figure 7

(a) Hysteresis curve comparison of N0, N25, N50, N75, and N100 samples and the saturation magnetization are 74, 67, 60, 35, and 51 (emu/g), respectively. (b) Zero-field-cooled and field-cooled magnetization curve of multi-iron core nanoparticles measured in 50 Oe. This type of nanoparticles exhibited low blocking temperature (30 K) and is in superparamagnetic state above 240 K. (c) This graph shows the changes between blocking temperature and iron median size for each sample.

(a)

(b)

(c)