(See online for better contrast of Fe3O4 particles.) Transmission electron micrographs of the (a) Sample B (Low-Au) and (b-d) Sample C (High-Au) nanocomposites. Fe3O4 can be seen in the background as faint particles of size 3–4 nm. Au particles are darker and are marked by arrows. Core(Fe3O4)-shell(Au) structures seen in Sample C are shown in (c) and (d).
Transmission electron micrographs and electron diffraction: (a) and (c) Sample A (Fe3O4); (b) and (d) core of the Sample C core shell particles. The diffraction rings in the (d) clearly shows presence of Fe3O4.
Magnetization vs H for Sample A (Pure), Sample B (Low-Au), and Sample C (High-Au) taken at 10 K and inset: 300 K.
Total energy in eV vs angular momentum Lz of an electron near the interface.
Net magnetic moment (orbital + spin) of the bound electrons near the interface (in ) vs the radius of the interface (in nm).
(a) Magnetization vs H for the Au-citrate sample taken at 5, 100, and 300 K up to a field of (a) 7 T and (b) expanded scale up to 1 T.
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