"The magnetic properties of the product were examined using a Quantum Design SQUID magnetometer at room temperature (figure [in ). As shown from the magnetic hysteresis loop, the products exhibit typical ferromagnetic curves, with a saturation magnetization of 41.6 emu g -1 . Taking into account that the sample contains 74% Fe3O4, this gives a value of 56.2 emu g -1 . This value is much lower than that of the corresponding bulk Fe3O4 (92 emu g -1 )" (Xuan et al., mentioning . This "may be due to the amorphous carbon shell", with a consequent "disordered structure at interfaces providing less magnetic moment per unit mass than that of ferromagnetic core regions"; the disorder is leading "to a decrease in the Ms" (Xuan et al., mentioning . Let us remember that 1 emu/g = 1 Am²/kg and 1 Oe = 79.57747 A/m. Then 1000 Oe are equal to 79.577 kA/m.