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Tuning the surface magnetism of γ-Fe2O3 nanoparticles with a Cu shell
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) (a) TEM image of Cu coated γ-Fe2O3 nanoparticles. (b) Intensity mapping of the interplaner distances shown in the HRTEM image of an amorphous Cu coated γ-Fe2O3 nanoparticle (c) where the solid line represents the background difference between Cu and γ-Fe2O3. (d) Particle size distributions determined from ∼100 particles in low resolution, large field of view, images of the bare and Cu‐coated nanoparticles. (e) Indexed electron diffraction pattern of the Cu/γ-Fe2O3 nanoparticles. (f) Transmission Mössbauer spectra at 10 K of the nanoparticle systems.

Image of FIG. 2.
FIG. 2.

(Color online) Temperature dependence of the saturation magnetization (Ms , top) and the exchange bias loop shift, Hex , of the bare γ-Fe2O3 (○) and Cu(0.5 nm)/γ-Fe2O3 () nanoparticles. The inset shows typical M vs μ 0  H behavior of the Cu(0.5 nm)/γ-Fe2O3 nanoparticles.

Image of FIG. 3.
FIG. 3.

(Color online) XAS and XMCD spectra results for the Cu(0.5 nm)/γ-Fe2O3 nanoparticles. (a) XAS spectra as a function of energy, with the top energy scale for the TFY Cu spectrum and the bottom energy scale for the TEY Fe spectrum. (b) L 3 edge normalized XMCD TEY signal of the Fe L 2,3 transitions in +5 T and −5 T with the characteristic signature of the octahedral (A-site) and tetrahedral (B sites) of γ-Fe2O3. (c) L 3 edge normalized TFY XMCD of Cu in +5 T (signal multiplied by a factor of 2.5) and −5 T showing clearly the presence of a magnetic moment on the Cu. (d) Temperature dependence of the Fe magnetization determined from the TEY XMCD signal and the Cu coating from the TEY XMCD signal.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Tuning the surface magnetism of γ-Fe2O3 nanoparticles with a Cu shell