Regensburg 2013 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 15: Poster Session

MM 15.67: Poster

Montag, 11. März 2013, 18:00–20:00, Poster E

An apparatus for the synthesis of cluster-based materials — •Arne Fischer, Herbert Gleiter, and Horst Hahn — Karlsruher Institut für Technologie, Institut für Nanotechnologie, 76344 Eggenstein-Leopoldshafen, Germany

A new cluster deposition system for the synthesis of materials composed of mass-selected clusters embedded in matrices of other materials as well as cluster-decorated surfaces was constructed and first deposition experiments were performed.

The system covers a large range of cluster sizes from single atoms up to clusters consisting of several thousands of atoms and the resulting cluster beam has a narrow size distribution. During the deposition the number of clusters as well as their impact energy is well defined. Hence this approach can open pathways to a new class of materials with tailored electronic, magnetic or catalytic properties.

As a first experiment iron clusters were deposited into a silver matrix. The immiscible system Iron-Silver is a well-known GMR material. In contrast to the production via e.g. MBE where only the composition is defined with our approach we have on top control over the size of the embedded clusters. Hence it allows studying the GMR effect as a function of cluster size and density in the material. Various samples with cluster sizes from 500 to 2000 atoms and different concentrations of clusters were produced and characterized with a SQUID magnetometer. The first results look promising and prove the exceptional capabilities of our new cluster deposition system.