Magnetism of cobalt nanoclusters on graphene on iridium
  The structure and magnetic properties of Co clusters, comprising from 26 to 2700 atoms, self-organized or not on the graphene/Ir(111) moir\'e, were studied in situ with the help of scanning tunneling microscopy and X-ray magnetic circular dichroism. Surprisingly the small clusters have almost no magnetic anisotropy. We find indication for a magnetic coupling between the clusters. Experiments have to be performed carefully so as to avoid cluster damage by the soft X-rays. 
Chi Vo-Van (NEEL), Stefan Schumacher, Johann Coraux (NEEL), Violetta   Sessi (SSOLEIL), Olivier Fruchart (NEEL), Nick B. Bro...
cond-mat.mtrl-sci