Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 49: POSTER II

MA 49.8: Poster

Donnerstag, 19. März 2015, 15:00–18:00, Poster A

Characterization of Single and Clustered Nanoparticles — •Martin Gottschalk, Nadine Mill, Karsten Rott, and Andreas Hütten — Center for Spinelectronic Materials and Devices, Physics Department, Bielefeld University, Germany

Nanoparticles of all kinds of shapes and material properties receive increasing attention due to their widely spread applications possible. As a consequence there is the need for characterization of the properties of not just nanoparticle clusters but also single nanoparticles. By exploiting the features of a dual beam system, consisting of a SEM and a FIB-microscope, it is possible to apply an electrical contact to single cobalt nanoparticles. The particles are connected by gas deposited platinum lines to e-beam-lithographed, conductive gold paths. These paths are the teeth of a comb whose shaft is a contact pad that can be used for GMR- or TMR-measurements of the particles outside the dual beam system. To attain a current running through just the connected particle, the other gold paths, which are now dispensable, are to be cut by the ion beam. Otherwise there would be a short circuit caused by larger clusters of particles, lying on several gold paths of the two combs, whose occurrence cannot be avoided in the course of the dropping down. Evidently this procedure is also suitable for clusters, if the spacing between the gold paths is respectively adjusted. With this setup it is possible to investigate single and clustered particle properties like magnetoresistive effects.