Regensburg 2022 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 5: Magnetic Instrumentation and Characterization

MA 5.3: Vortrag

Montag, 5. September 2022, 10:00–10:15, H48

Detection of nanowire vibrations with a co-resonantly coupled cantilever system — •Maneesha Sharma, Aniruddha Sathzadharma Prasad, Bernd Büchner, and Thomas Mühl — Leibniz Institute for Solid State and Materials Research, IFW Dresden, Germany

Nanowires can constitute the basis for high-sensitivity sensing of masses and magnetic properties of nanoparticles. We report a novel and efficient yet simple method for detecting nanowire flexural vibrations. In this work we present a co-resonantly coupled cantilever system consisting of a microcantilever and a nanocantilever. Achieving co-resonance involves matching the resonance frequencies of the individual systems. It allows us to measure the coupled system*s eigenmodes at the microcantilever. In the co-resonant state weak force gradients acting at the nanowire end have a considerable impact on the eigenmodes of the coupled system and thus can be easily sensed at the microcantilever.

We analyze mechanical properties of the nanowire subsystem and of the coupled system by exploiting thermally induced fluctuations which are measured by recording time-resolved secondary electron signals when using an electron beam and, in case of the microcantilever, by optical laser deflection. Finally, we discuss applications of the coupled cantilever sensor for high-sensitivity magnetometry.