Dresden 2011 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 34: Nanomaterials I

MM 34.7: Vortrag

Donnerstag, 17. März 2011, 12:30–12:45, IFW B

Correlation of structure and electron transport in Fe filled carbon nanotubes — •Vadim Migunov, Marina Spasova, and Michael Farle — Fakultät für Physik, and CeNIDE University Duisburg-Essen, 47048 Duisburg, Germany

Carbon nanotubes (CNT) are potentially the interesting building blocks for different types of future electronic and mechanical devices. The filling of CNT with magnetic materials opens new multifunctional possibilities for novel applications.

The Fe filled CNT (FeCNT) were synthesized by chemical vapor deposition [1]. Transport studies were conducted inside a Philips CM-12 transmission electron microscope (TEM) using Nanofactory scanning probe microscopy (SPM) holder for TEM. A gold SPM tip was brought in contact with a single FeCNT, and two-point resistance measurements were carried out.

We have found that high current densities (>10¹⁰ A/m²) lead to evaporation of Fe in FeCNT. After the evaporation the total resistance of the system decreases by up to a factor of three as confirmed by steps in the I-V curves.

The work has been supported by SFB 445. The FeCNT were prepared by the CVD group of the IFW Dresden.

[1] A. Leonhardt, M. Ritschel, R. Kozhuharova, A. Graff, T. Muhl, R. Huhle, I. Monch, D. Elefant, C. M. Schneider, Diamond and Relat. Mater. 12, 790 (2003)