Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 35: Nanostructures at Surfaces

O 35.6: Poster

Dienstag, 17. März 2015, 18:15–21:00, Poster A

Temperature dependent shape of deposited FeNi nanoparticles — •Matthias Werner, Hendrik Bettermann, and Mathias Getzlaff — Institute of Applied Physics, University of Duesseldorf

Most of the properties of nanoparticles significantly depend on their size. For alloy systems the stoichiometry also plays an important role. In this contribution we report on the temperature dependent shape of size-selected deposited FeNi nanoparticles. This investigation is carried out by STM.

Fe50Ni50 Nanoparticles are produced by an arc cluster ion source (ACIS) and mass-filtered by an electrostatic quadrupole. The particles with diameters from 5 to 15 nm are deposited under UHV and soft-landing conditions on a W(110) surface. They are tempered in situ by a resistive heater integrated in the manipulator. The heating process is varied in intensity and time. Melting point and variations close to it are observed to depend on the clusters' diameter. The influence of the anisotropy of the W(110) surface is also taken into consideration.