Regensburg 2004 – wissenschaftliches Programm

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O: Oberflächenphysik

O 10: Teilchen und Cluster I

O 10.4: Vortrag

Montag, 8. März 2004, 16:30–16:45, H43

Quenching of surface magnetic moments in rare gas isolated Ni clusters — •Kai Fauth1,2, Markus Heßler1,2 und Gisela Schütz21Physikalisches Institut der Universität Würzburg, Am Hubland, 97074 Würzburg — 2MPI für Metallforschung, Heisenbergstraße 3, 70569 Stuttgart

X-ray magnetic circular dichroism (XMCD) is a method well suited for the element specific analysis of magnetic moments in transition metals. The XMCD technique allows their quantitative analysis in terms of spin and orbital contributions. The application of XMCD to small clusters is only possible if these are deposited on a substrate. Their deposition into rare gas matrices is the best possible approximation to noninteracting clusters. While this approach is succesful in the case of Fe and Co clusters, we show here that the same is not true in the case of small Ni clusters. The observed magnetizations are by far smaller than expected. Their size dependence suggests a quenching of the magnetic Ni moments to occur at the cluster surface, induced by the presence of the Ar environment. Similar results were theoretically obtained previously for Ni clusters encapsulated by a He shell [1].
G. Pacchioni, S. C. Chung, S. Krüger and N. Rösch, Chem. Phys. 184, 125 (1994)

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