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 Schütz21Physikalisches 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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S.R. Liu, H. J. Zhai, and L.S. Wang, Phys. Rev. B 65, 113401 (2002)

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