Berlin 2008 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 11: C/diamond

HL 11.4: Talk

Monday, February 25, 2008, 11:45–12:00, EW 202

Synthesis and investigation of iron-filled carbon nanotubes as probes for magnetic force microscopy — •Uhland Weißker, Thomas Mühl, Albrecht Leonhardt, Christine Täschner, Siegfried Menzel, Franziska Wolny, Christian Müller, and Bernd Büchner — Leibniz Institute for Solid State and Material Research IFW, Dresden

Magnetic force microscopy is a powerful method for imaging magnetic stray fields of magnetic surfaces with high spatial resolution. For magnetic force microscopy a conventional atomic force microscopy tapping mode cantilever is coated with a magnetic layer that interacts with the sample stray field. Using this kind of probes the rather complicated pyramid shape of the probe influences the measurement results. Because of that, a straightforward quantitative interpretation of MFM data is hardly possible. On the other hand, quasi one-dimensional ferromagnetic wire-shaped probes should allow quantitative stray field measurements.

One promising solution is the use of iron-filled carbon nanotubes as scanning tip. The filled nanotubes offer a high aspect ratio, good mechanical properties and are magnetic. We report a chemical vapour deposition method (CVD) for fabrication of in-situ filled carbon nanotubes, which exhibit a long continuous iron-filling of several microns. The nanotube structure is investigated by SEM and TEM, whereas the filling is examined by AGM, XRD and EELS.