Physics – Condensed Matter – Materials Science
Scientific paper
2011-09-09
Physics
Condensed Matter
Materials Science
29 pages including 11 figures embedded. Submitted to Phys. Rev. B
Scientific paper
10.1103/PhysRevB.84.144430
Co-based nanostructures ranging from core-shell to hollow nanoparticles were produced by varying the reaction time and the chemical environment during the thermal decomposition of Co2(CO)8. Both structural characterization and kinetic model simulation illustrate that the diffusivities of Co and oxygen determine the growth ratio and the final morphology of the nanoparticles. Exchange coupling between Co and Co-oxide in core/shell nanoparticles induced a shift of field-cooled hysteresis loops that is proportional to the shell thickness, as verified by numerical studies. The increased nanocomplexity when going from core/shell to hollow particles, also leads to the appearance of hysteresis above 300 K due to an enhancement of the surface anisotropy resulting from the additional spin-disordered surfaces.
Angelakeris M.
Cabot Andreu
Delimitis A.
Dendrinou-Samara C.
Iglesias Oscar
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