Size Distribution of Cobalt Nanocrystals: A Key Parameter in Formation of Columns and Labyrinths in Mesoscopic Structures


  • We are grateful to Dr. D. Ingert and Dr. J. Richardi for many fruitful discussions.


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Columnar or labyrinthine mesostructures of magnetic nanocrystals (see Figure) are obtained by applying a perpendicular magnetic field during evaporation of the nanocrystal solution. The effect of the polydispersity of the nanocrystals is investigated, and the size distribution of the nanocrystals appears to be a key factor in the formation of one particular structure.