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Spherical or branch-like architectures assembled from Ni nanocones have been synthesized. Micromagnetic simulation of a single Ni nanocone reveals that it has a unique magnetization structure with a vortex structure at the bottom and a uniform structure at the top. Two resonance peaks at 4.4 and 12.0GHz appear in the high-frequency magnetic spectrum. The complex permittivity is very low in the frequency...
Atomic-scale calculation on the elastic modulus and theoretical tensile strength of Au nanowires shows that they increase almost logarithmically with wire thinning. According to ab initio simulations, we attribute the improvement of the mechanical properties to the enhanced attraction between atoms due to surface induced electron charge redistribution.
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