Fig. 1
From: Magnetic core–shell nanowires as MRI contrast agents for cell tracking
Characterization of Fe-based NWs. a SEM image of NWs. b TEM image of NWs. c EELS mapping of a single NW. STEM image with superimposed Fe (red) and oxygen (blue) color mix map of NWs with native oxidation layer. The scale bar corresponds to 50 nm. d Magnetization curves of Fe-based NWs with native oxide layer (black curve) and oxidized NWs (red curve) (Magnetization M is presented as Am2/kg of Fe, MS is the saturation magnetization and HC the coercive field, n = 3)