Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 40: Poster II: Bio- and Molecular Magnetism (1-9); Magnetic Coupling Phenomena/Exchange Bias (10-15); Magnetic Particlicles and Clusters (16-29); Micro and Nanostructured Magnetic Materials (30-51); Multiferroics (52-64); Spin Injection in Heterostructures (65-67); Spin-Dyn./Spin-Torque (68-93); Spindependent Transport (94-108)

MA 40.20: Poster

Freitag, 27. März 2009, 11:00–14:00, P1A

Magnetic field effect on the assembly of FePt and CuAu nanoparticles from the gas phase on amorphous carbon — •Ute Queitsch, Inge Lindemann, Darius Pohl, Bernd Rellinghaus, and Ludwig Schultz — IFW Dresden, P.O. Box 270116 D-01171, Germany

The key to successful applications of nanoparticles is their organization at the nanoscale, i.e. the creation of defined and regular nanostructures of particles with controlled morphology in highly ordered arrays. Gas phase preparation has proven to allow for the preparation of nanoparticles of various materials with narrow size distribution. A regular arrangement of the particles was accomplished by self organization on bacterial S layer templates [1]. One problem inherent to this approach is the agglomeration of the nanoparticles due to the statistical arrival at the substrate. The deposition of gas phase prepared FePt nanoparticles with 5 nm in size in the presence of a magnetic field of 1 T onto carbon-coated TEM grids leads to the formation of hexagonal-like particles patterns with interparticle distances of 7nm and thereby to a significant decrease of agglomeration [2]. Interestingly, comparable results are found for CuAu nanoparticles. The magnetic properties of the CuAu nanoparticles and the physical origin for the observed self-organization are discussed.

[1] U.Queitsch et al., Appl. Phys. Lett. 90, 113114 (2007)

[2] U.Queitsch et al., J. Phys. D: Appl. Phys., 41 (2008)