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Lecture

Magnetoelectric sensors – the impact of the mechanical quality factor on the signal to noise ratio

Thursday (08.06.2017)
12:30 - 12:50 Förde II
Part of:


Magnetoelectric sensors with cantilever geometry achieve great sensitivities on the order of 20 kV/cmOe by utilizing the mechanical resonance enhancement [1]. Here, the cantilever quality factor serves as a figure of merit. There are several technologically approaches to increase the mechanical quality factor of cantilevers, e.g. reducing viscous damping or support losses. However, increasing the quality factor may also lead to increasing noise levels, originating form acoustic and thermal noise. In this contribution, we will discuss the impact of the quality factor onto the signal-to-noise ratio (SNR) of magnetoelectric sensors based on systematic cantilever geometry variation and operation under vacuum conditions. Approaches to increase the SNR will be high-lighted. The experiments are based on different magnetoelectric sensors consisting of 50 µm to 10 µm thick poly-silicon cantilevers (length 3 mm to 1 mm) [2]. The functional materials are 2 µm AlN as piezoelectric phase and 2 µm FeCoSiB as magnetostrictive phase.


Funding by the Collaborative Research Center SFB 1261 is gratefully acknowledged.



[1] Kirchhof, C., Krantz, M., Teliban, I., Jahns, R., Marauska, S., Wagner, B., Quandt, E. (2013). Giant magnetoelectric effect in vacuum. Applied Physics Letters, 102(23), 232905. doi.org/10.1063/1.4810750

[2] Zabel, S., Kirchhof, C., Yarar, E., Meyners, D., Quandt, E., Faupel, F. (2015). Phase modulated magnetoelectric delta-E effect sensor for sub-nano tesla magnetic fields. Applied Physics Letters, 107(15), 152402. doi.org/10.1063/1.4932575

Speaker:
Christine Kirchhof
Kiel University (CAU)
Additional Authors:
  • Erdem Yarar
    Kiel Universitiy
  • Phillip Durdaut
    Kiel Universitiy
  • Jens Reermann
    Kiel Universitiy
  • Matthias Krantz
    Kiel Universitiy
  • Simon Fichtner Fichtner
    Kiel Universitiy
  • Fabian Lofink
    Fraunhofer Institute for Silicon Technology
  • Berhard Wagner
    Fraunhofer Institute for Silicon Technology
  • Martina Gerken
    Kiel Universitiy
  • Gerhard Schmidt
    Kiel Universitiy
  • Michael Höft
    Kiel Universitiy
  • Dirk Meyners
    Kiel Universitiy
  • Eckhard Quandt
    Kiel Universitiy