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MA: Fachverband Magnetismus

MA 16: Magnetic characterization techniques

MA 16.9: Talk

Tuesday, March 13, 2018, 11:45–12:00, H 0112

Mechanical detection of nanomagnetic phenomena employing coupled nano- and micro-cantilever systems — •Thomas Mühl, Christopher Friedrich Reiche, Julia Körner, and Bernd Büchner — IFW Dresden, Dresden, Germany

Magnetic force microscopy (MFM) and cantilever magnetometry are nanomagnetic measuring techniques that rely on cantilever-based force transducers. Their sensitivity can be improved by reducing the cantilever's dimensions which may lead to difficulties in their read-out. Our recently developed sensor concept [1,2] addresses this issue by a co-resonant coupling of a tiny nanocantilever to a rather conventional microcantilever. The co-resonance is achieved through matching of the eigenfrequencies of the two cantilevers. Thus, if the highly sensitive nanocantilever is subject to an external interaction, the oscillatory state of the coupled system as a whole is changed. This change can be detected at the microcantilever with standard equipment. We present analytical approximations of the resonant behavior, amplitude relations, and effective quantities with respect to damping, mass, and spring constant of the coupled system. Furthermore, we show how the experimental implementation of our approach in MFM enables a huge sensitivity enhancement in case of an in-plane sensitivity imaging mode with the nanocantilever arranged in a pendulum-type geometry.

[1] C. F. Reiche, J. Körner, B. Büchner, and T. Mühl, Nanotechnology 26, 335501 (2015).

[2] J. Körner, C. F. Reiche, R. Ghunaim, R. Fuge, S. Hampel, B. Büchner, and T. Mühl, Sci. Rep. 7, 8881 (2017).