Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 18: Poster I : Bio Magn. (1-2); Mag.Imgaging (3-9); Magn. Semiconductors (10-16); Half Metals & Oxides (17-20); Coupl.Phenomena (21-27); Magn. Mat. (28-41); Micro & Nanostr. Magn. Materials (42-61); Micro Magn. (62-64); Surface Magnetism (65-70); Transport Phenomena (71-85)

MA 18.4: Poster

Dienstag, 26. Februar 2008, 15:15–18:30, Poster E

Iron filled carbon nanotubes as probes for magnetic force microscopy — •Franziska Wolny, Thomas Mühl, Uhland Weißker, Albrecht Leonhardt, and Bernd Büchner — Leibniz-Institut für Festkörper- und Werkstoffforschung (IFW) Dresden

Iron filled carbon nanotubes (Fe-CNTs) were used to prepare probes for magnetic force microscopy (MFM) by attaching them to the tip of non-magnetic atomic force microscopy cantilevers.

These Fe-CNTs can be regarded as cylinder shaped single domain nanomagnets that are protected from oxidation by a carbon shell. Carbon nanotubes are known to possess both great mechanical stability and elasticity which lead to a much longer lifetime of these probes compared to conventional magnetically coated probes. They exhibit a very high aspect ratio leading to improved topographic imaging on the one hand and better magnetic resolution in MFM on the other hand. In the limit of very long iron nanowires, the lower wire end can be considered as an effective magnetic monopole moment which allows straightforward quantitative stray field measurements.

It has also been shown that attached Fe-CNTs can subsequently be tailored by electron-beam induced oxidation (e.g. to remove disturbing empty carbon shell parts or sharpen the tip) to better fit the requirements of an MFM tip.