Regensburg 2004 – wissenschaftliches Programm
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O: Oberflächenphysik
O 19: Teilchen und Cluster II
O 19.1: Vortrag
Dienstag, 9. März 2004, 11:15–11:30, H39
Size dependent magnetic properties of small Co clusters — •Markus Heßler1,2, Kai Fauth1,2, and Gisela Schütz2 — 1Physikalisches Institut, Universität Würzburg, Am Hubland, 97074 Würzburg — 2MPI für Metallforschung, Heisenbergstraße 3, 70569 Stuttgart
The magnetization of small transition metal clusters
is, in general, a nonmonotonous function of their size. [1,2]
We have characterized the magnetization of a number of
atomically size-selected CoN clusters in the size range
between N=13 and N=60 atoms per cluster with x-ray magnetic
circular dichroism measurements. Strong size dependences
are indeed observed. Contrary to the
general expectation, Co55 posesses a very high spin
magnetic moment of ≈ 3 µB per atom.
Based on our results we propose that the strong magnetization
around N=55 correlates with peculiarities around this cluster
size in the gas phase anion photoelectron spectra [3].
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