341073.fig.002a
(a)
341073.fig.002b
(b)
Figure 2: Investigation of F e 3 O 4 nanoparticle by Ntegra Aura system (Scanning Probe Microscope): (a) sample of F e 3 O 4 nanoparticles in 2.0 × 2.0  𝜇 m scanning area, (b) two nanoparticles have been measured and the dimensions are 14.94 nm and 12.82 nm.