Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 10: Nanostructures at Surfaces I

O 10.5: Vortrag

Montag, 11. März 2013, 11:30–11:45, H45

Energy dependent nanoparticle deposition on a W(110) surface — Wolfgang Rosellen, •Hendrik Bettermann, Torsten Veltum, and Mathias Getzlaff — Institute of Applied Physics, University Duesseldorf

Deposited clusters and nanoparticles are rather interesting objects not only from a fundamental point of view but additionally for technological applications due to their electronic and magnetic properties which depend strongly on the particle size. The structure determination after deposition is important because it significantly influences these properties. Our contribution is focused on magnetic 3d-nanoparticles on a W(110) substrate. After creation in the gas phase by a UHV compatible Arc Ion Cluster Source (ACIS) these particles are size selected by an electrostatic quadrupole. Mass selection and acceleration are possible because 50% of the particles are positively or negatively charged. Applying a voltage to the targeted substrate allows us therefore to change the deposition energy. Our investigations are carried out by means of scanning tunneling microscopy (STM). We will report on size and structural properties of Fe/Co particles at softlanding conditions at a kinetic energy below 1 eV per atom and compare it with accelerated and decelerated particles. We demonstrate that deceleration leads to reduced deformation whereas acceleration results in leaving the softlanding regime.