Abstract
The size-dependent chemical tunability of spin−lattice relaxation rate in magnetic nanocrystals has been investigated in size and composition-controlled colloidal superparamagnetic CoxFe3−xO4 nanocrystals employing pump−probe Faraday rotation measurements. With the increase of cobalt content in CoxFe3−xO4 nanocrystals, spin−lattice relaxation rate increased due to the increasing spin−orbit coupling strength regardless of the particle size. However, the range of the chemical tunability of spin−lattice relaxation was narrower in the smaller nanocrystals and the size dependence of spin−lattice relaxation rate became weaker with increasing cobalt content. These observations were explained in terms of weaker chemical tunability of spin−orbit coupling on the surface than in the interior of the nanocrystals using a simple model for spin−lattice relaxation rate that has both surface and interior contributions.
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