Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 54: Nanostructures at surfaces II

O 54.7: Vortrag

Mittwoch, 28. März 2012, 18:15–18:30, MA 042

Behavior of Co, Fe and FeCo alloy nanoparticles deposited on W(110) — •Wolfgang Rosellen, Hendrik Bettermann, Torsten Veltum, and Mathias Getzlaff — Institute of Applied Physics,University Duesseldorf

In contrast to free nanoparticles, deposited clusters and particles become more and more interesting from a technological point of view due to their size dependent electronic and magnetic properties. Therefore, it is important to have access to the structure of the particles after deposition. In this contribution we will discuss different aspects of mass and therefore size selected magnetic 3d-nanoparticles deposited on W(110). The deposited nanoparticles, mainly Fe, Co and their alloys are investigated by means of Scanning Tunneling Microscopy in-situ under UHV conditions. For our investigations we assemble the nanoparticles in the gas phase by a UHV compatible Arc Ion Cluster Source (ACIS)[1] being developed for softlanding condition. At this regime, a kinetic energy below 1 eV/atom, nanoparticles could be deposited without deformation. We will discuss the properties of individual particles as well as statistically appreciable particle ensembles. Therefore, we will report on size dependent structural properties including crystallographic structure, height and size, shape, the influence of substrate etc. We will additionally focus on the melting behavior of nanoparticles. Finally, we demonstrate a method for the spontaneous orientation of Fe, Co and alloy nanoparticles deposited on W(110).

[1] R.-P. Methling et al., European Physical Journal D 16, 173 (2001)