Burrowing self-organized cobalt clusters into a gold substrate
Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504,
CNRS Université Louis Pasteur - 23 rue du Loess, F-67037 Strasbourg Cedex, France
Accepted: 25 November 1998
The mechanism of cobalt-cluster incorporation into a Au(111) substrate is followed by variable temperature STM, Auger spectroscopy, and in situ magneto-optic Kerr (MOKE) measurements. Upon thermal activation, cobalt clusters sink into the substrate by simultaneously expelling gold atoms which, in turn, contribute by embedding the remaining cobalt clusters. Although important mass transport occurs during this operation, MOKE indicates that the clusters remain globally undisturbed, until finally, irreversible cluster fragmentation and dissolution occur above 600 K.
PACS: 61.46.+w – Clusters, nanoparticles, and nanocrystalline materials / 78.20.Ls – Magnetooptical effects / 61.72.Cc – Kinetics of defect formation and annealing
© EDP Sciences, 1999