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A one-pot, two-step colloidal strategy to prepare bimagnetic hybrid nanocrystals (HNCs), comprising size-tuned fcc FePt and inverse spinel cubic iron oxide domains epitaxially arranged in a heterodimer configuration, is described. The HNCs have been synthesized in a unique surfactant environment by temperature-driven sequential reactions, involving the homogeneous nucleation of FePt seeds and the subsequent heterogeneous growth of iron oxide. This self-regulated mechanism offers high versatility in the control of the geometric features of the resulting heterostructures, circumventing the use of more elaborate seeded growth techniques. It has been found that, as a consequence of the exchange coupling between the two materials, the HNCs exhibit tunable single-phase-like magnetic behavior, distinct from that of their individual components. In addition, the potential of the heterodimers as effective contrast …
American Chemical Society
Publication date: 
30 Jan 2008

Albert Figuerola, Angela Fiore, Riccardo Di Corato, Andrea Falqui, Cinzia Giannini, Edoardo Micotti, Alessandro Lascialfari, Maurizio Corti, Roberto Cingolani, Teresa Pellegrino, Pantaleo Davide Cozzoli, Liberato Manna

Biblio References: 
Volume: 130 Issue: 4 Pages: 1477-1487
Journal of the American Chemical Society