Silver nanodisks: Size selection via centrifugation and optical properties

International audienc

Unusual static and dynamic magnetic properties of Cd1−y_{1-y}Mny_yS nanocrystals

URL: http://www-spht.cea.fr/articles/s00/001 Effets de taille dans les propriétés magnétiques statiques et dynamiques de nanoparticules de Cd$_{1-y}$Mn$_y$SMagnetic properties of Cd$_{1-y}$Mn$_y$S nanocrystals have been studied. They vary with the particle size and markedly differ from those observed in the bulk phase, in particular their interactions drastically increase compared to those observed in the latter case. A Mn$^{2+}$-Mn$^{2+}$ interaction enhancement with decreasing size involves changes in the magnetic phase diagram. For 4nm nanocrystals, a spin glass phase can be assumed