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MA: Fachverband Magnetismus

MA 31: Magnetic Imaging

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 [1]. Moreover, as compared to conventional coated MFM probes, FeCNT sensors show remarkable magnetic stability in external in-plane fields [2].

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.

[1] F. Wolny, T. Mühl, U. Weissker, K. Lipert, J. Schumann, A. Leonhardt, and B. Büchner, Nanotechnology 21, 435501 (2010).

[2] F. Wolny, T. Mühl, U. Weissker, A. Leonhardt, U. Wolff, D. Givord, and B. Büchner, J. Appl. Phys. 108, 01398 (2010).