Dresden 2009 – scientific programme

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MA: Fachverband Magnetismus

MA 10: Magnetic Imaging

MA 10.5: Talk

Monday, March 23, 2009, 18:15–18:30, HSZ 403

Iron filled carbon nanotubes as probes for magnetic force microscopy — •Franziska Wolny, Uhland Weissker, Kamil Lipert, Thomas Mühl, Albrecht Leonhardt, and Bernd Büchner — Leibniz-Institut für Festkörper- und Werkstoffforschung (IFW) Dresden, Helmholtzstraße 20, 01069 Dresden

Iron-filled carbon nanotubes (Fe-CNTs) were used to prepare probes for magnetic force microscopy (MFM) by attaching them to the tips of conventional atomic force microscopy cantilevers. Fe-CNTs can be regarded as cylindrically 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. It is shown that the prepared probes are suitable for magnetic imaging with a good magnetic resolution.

The long iron nanowire enclosed in the carbon shell can be regarded as an extended magnetic dipole of which only the monopole closest to the sample surface interacts with the sample stray field. Thus, the Fe-CNT probes can be calibrated for quantitative MFM measurements by determining their monopole moment. First calibration experiments to quantify the effective magnetic monopole moment of the probe by measuring test structures with a defined magnetic stray field will be presented.