Regensburg 2010 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 33: Poster II
MA 33.45: Poster
Freitag, 26. März 2010, 11:00–14:00, Poster B1
Quantitative Magnetic Force Microscopy with iron filled carbon nanotubes (Fe-CNT) — •Silvia Vock1, Franziska Wolny1, Ulrike Wolff1, Christoph Hassel2, Jürgen Lindner2, Thomas Mühl1, Volker Neu1, and Ludwig Schultz1 — 1IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany — 2Fachbereich Physik, Experimentalphysik, AG Farle, Universität Duisburg-Essen, 47048 Duisburg, Germany
The quantitative measurement of magnetic stray fields with Magnetic Force Microscopy (MFM) requires calibrated MFM tips. Conventional MFM probes are usually Si cantilevers with a sharp pyramidal tip, hard magnetically coated. The lateral extension of the magnetically active volume of the tip coating reduces the resolution and makes the overall quantitative description difficult. Using the simple point probe approximation, the tip parameters such as the size of the magnetic moment and its fictive position within the tip depend strongly on the measured stray field geometry. In contrast to that a Fe filled carbon nanotube (Fe-CNT), which is attached to a conventional force microscopy cantilever, constitutes an MFM tip with well defined geometry, a high aspect ratio and a homogenous magnetization. We will show that for such a tip the point probe parameters are independent of the measured magnetic structure. Calibration of both tip types was performed on perpendicularly magnetized CoPt stripes with varying width from 300 to 2200 nm. Quantitative MFM measurements were successfully performed on a [Co/Pt]/Ru multilayer sample by using the calibrated Fe-CNT tip revealing the correct sample magnetization.