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O: Fachverband Oberflächenphysik
O 84: Scanning Probe Techniques: Method Developments
O 84.2: Vortrag
Donnerstag, 10. März 2016, 15:30–15:45, S054
Co-resonant scanning force microscopy sensors — •Christopher F. Reiche1, Julia Körner1, Bernd Büchner1,2, and Thomas Mühl1 — 1Leibniz-Institut für Festkörper- und Werkstoffforschung IFW Dresden — 2Institut für Festkörperphysik, Technische Universität Dresden
A possible route to enable the detection of very small interaction forces in dynamic mode scanning force microscopy (SFM) is to decrease the spatial dimensions of the cantilever force sensor to reduce its effective spring constant and increase its resonance frequency. However, this approach is limited by the required operational stability of the sensor to avoid snap-ins and the capability of the equipment to still reliably detect the sensor’s oscillatory state.
By applying a recently developed co-resonant sensor concept [1] to bidirectional scanning force microscopy sensors [2], it is possible to combine the stability and ease-of-detection of a standard SFM cantilever with the high sensitivity of a nanocantilever. Since the measurement signal is still generated by observing changes in the oscillatory state of the standard cantilever, these novel sensors for dynamic mode SFM are still compatible with common SFM equipment.
To demonstrate the performance of these sensors, we employed iron filled carbon nanotubes as nanocantilevers to achieve sensitivity to magnetic stray fields. A comparison of experimental results to calculated data reveal a signal increase by three orders of magnitude compared to standard force sensors.
C.F. Reiche, J. Körner et al., Nanotechnology 26 (2015) 335501
C.F. Reiche et al., New J. Phys. 17 (2015) 13014