From Colloidal Co/CoO Core/Shell Nanoparticles to Arrays of Metallic Nanomagnets: Surface Modification and Magnetic Properties (pages 2522–2526)
Ulf Wiedwald, Kai Fauth, Markus Heßler, Hans-Gerd Boyen, Frank Weigl, Michael Hilgendorff, Michael Giersig, Gisela Schütz, Paul Ziemann and Michael Farle
Article first published online: 4 NOV 2005 | DOI: 10.1002/cphc.200500148
Cobalt nanomagnets are formed when Co/CoO core/shell nanoparticles are exposed to a mild reactive hydrogen plasma. In the particle monolayer, agglomeration does not occur during this process. X-ray absorption and magnetic circular dichroism proved ideally suited to monitor the process and to study nanoparticle magnetism in detail. In the picture, the magnetization loop of the metallic magnets is superimposed on a transmission electron microscopy image of their Co/CoO precursor.