FeO/Au NPs

Iron oxide nanoparticles coated with gold: Enhanced magnetic moment due to interfacial effects.
S. Banerjee, S. O. Raja, M. Sardar, N. Gayathri, B. Ghosh, and A. Dasgupta
JAP 109, 123902 (2011)

TEM of the (a) Sample B (Low-Au) and (b-d) Sample C (High-Au)
nanocomposites. Core(Fe3O4)-shell(Au) structures seen in Sample C
are shown in (c) and (d).