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Metallic Magnetic Nanocrystals – Shapes, Self-assembly and Phase Transformation

Controlled assembly of magnetic nanocrystals (NCs) has been a key issue in fabricating functional nanodevices. Extensive investigations in NC assemblies have revealed that the symmetry of the observed superlattices is influenced by the NC size, NC shape and relative dimensions of the NC core and the organic capping. Our study has been focused on investigating the roles played by NC shape in self-assembly and the mechanism by which defects are created [1]. The key challenges in this self -assembly method are to control the defects of the self -assembly to ensure an ordered structure, and to prepare an assembly with uniform thic kness and large lateral dimension. For the 11 nm Co NCs and their superlattice assembly (Fig. 1), the Co NCs have anisotropic polyhedral shapes (Fig. 2) [2]. The self -assembly of the NCs and the defect structures in the NC arrays are governed by the anisot ropic shape. The self-assembly of nanocrystals with faceted shape is dominated by a surface-to-surface contact. This simple geometrical matching is the root for creating defects in the self-assembly. The structural transformation of shape-controlled nanocrystals has been studied by transmission electron microscopy.