Berlin 2012 – wissenschaftliches Programm
MA 31.4: Vortrag
Mittwoch, 28. März 2012, 15:45–16:00, BH 243
Monopole-like probes for Magnetic Force Microscopy — •Thomas Mühl, Julia Körner, Albrecht Leonhardt, and Bernd Büchner — Leibniz-Institut für Festkörper- und Werkstoffforschung IFW Dresden
Magnetic force microscopy (MFM) is a powerful method dedicated to map stray-field distributions, or more precisely, derivatives in space of magnetic field components. Recently we developed a sensor for quantitative MFM based on an iron-filled carbon nanotube (FeCNT). The long Fe nanowire contained in the carbon nanotube can be regarded as an arrangement of two well-separated magnetic monopoles of which only the monopole nearest to the sample surface is involved in the imaging process. The monopole-like character of FeCNT MFM probes allows easy calibration . Moreover, as compared to conventional coated MFM probes, FeCNT sensors show remarkable magnetic stability in external in-plane fields .
In this work, we present an improved MFM sensor design again employing FeCNTs. By using higher order flexural vibration modes of the cantilever the new sensor provides both in-plane and perpendicular sensitivity for quantitative MFM measurements. We discuss sensitivity issues related to the dynamic spring constants of the sensor.
 F. Wolny, T. Mühl, U. Weissker, K. Lipert, J. Schumann, A. Leonhardt, and B. Büchner, Nanotechnology 21, 435501 (2010).
 F. Wolny, T. Mühl, U. Weissker, A. Leonhardt, U. Wolff, D. Givord, and B. Büchner, J. Appl. Phys. 108, 01398 (2010).