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MM: Fachverband Metall- und Materialphysik

MM 38: Nanostructured Materials II

MM 38.3: Vortrag

Donnerstag, 26. März 2009, 10:45–11:00, IFW B

Mechanical properties of iron-filled CNTs — •Uhland Weissker, Markus Löffler, Franziska Wolny, Thomas Mühl, Siegfried Menzel, Albrecht Leonhardt, and Bernd Büchner — IFW Dresden, (PF 270116, 01171

Iron-filled carbon nanotubes (CNTs) are promising nanoscale probes for magnetic force microscopy. To achieve high lateral magnetic as well as topographic resolution, a high stiffness of the nanotube is one of the requirements. Iron-filled CNTs combine several advantages. The filling creates a more localized and harder magnetic moment than common coated cantilevers. The CNT shells protect the filling from oxidation and also ensure high mechanical stability. In this work we performed mechanical investigations on iron-filled CNTs by dynamic and static bending. In the dynamic method a high frequency electric field is applied to the CNT in order to excite a resonant oscillation. In the static method a Lorentz force acts on a current-carrying CNT in the presence of a strong magnetic field (2 Tesla), which is provided by the lens system of a transmission electron microscope (TEM). The CNT mounting is carefully considered; it can be modeled as a torsion spring and provides a correction to the calculated Young's modulus. Depending on the CNT diameter, we found a wide variation in the Young's modulus of iron-filled CNTs.