Abstract
The present work seeks to enlarge the FePt nanocrystal size by submitting Colloidal Nanoparticle Clusters (CNCs) coated by a FeOx shell (FePt@FeOx) to a thermal treatment. The nanostructures were prepared by thermal decomposition in organic media under limited surfactant protection. By adjusting the molar ratio of surfactants it is possible to control the degree of oxidation and aggregation of the CNCs. The FeOx coating of the FePt CNCs resulted to be crucial during the thermal treatment to achieve a controlled crystal growth and induce a structural transition to tetragonal L10 FePt phase producing 31nm nanocrystals with high magnetization and coercivity. Clustering and controlled oxidation is proposed here as a new method to overcome size limitation in the synthesis of FePt nanoparticles.
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