Electronic properties of mixed transition metal clusters: Co cluster embedded in Ag

JAVIER GUEVARA; ANA MARÍA LLOIS; MARIANA WEISSMANN

REVISTA MEXICANA DE FíSICA

SOC MEXICANA FISICA

Lugar: México; Año: 1998 vol. 44 p. 29 - 33

0035-001X

<!-- @page { size: 8.5in 11in; margin: 0.79in } P { margin-bottom: 0.08in } --> We report on a systematic study of the electronic and magnetic properties of small Co clusters covered with Ag (Co N Ag M, N+M up to 297). The properties of these mixed transition metal clusters are related to the experimental arrangements observed in granular systems. For example, it has been reported that the GMR effect of these granular systems depends on their size, shape and magnetization. Up to now very few calculations have been performed to describe embedded clusters, while the experimental work has been growing steadily. It is therefore of interest to calculate the magnetization in order to explore the influence of cluster size and shape. We show that, for a given number of Co atoms, the total magnetic moment per Co depends on the size and shape of the Ag covering. We compare with 3D FLAPW calculations done for some particular structures.