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Iron oxide nanoparticles coated with gold: Enhanced magnetic moment due to interfacial effects
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View: Figures


Image of FIG. 1.
FIG. 1.

(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).

Image of FIG. 2.
FIG. 2.

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.

Image of FIG. 3.
FIG. 3.

Magnetization vs H for Sample A (Pure), Sample B (Low-Au), and Sample C (High-Au) taken at 10 K and inset: 300 K.

Image of FIG. 4.
FIG. 4.

Total energy in eV vs angular momentum Lz of an electron near the interface.

Image of FIG. 5.
FIG. 5.

Net magnetic moment (orbital + spin) of the bound electrons near the interface (in ) vs the radius of the interface (in nm).

Image of FIG. 6.
FIG. 6.

(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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Iron oxide nanoparticles coated with gold: Enhanced magnetic moment due to interfacial effects