Thermal-Mechanical Noise in Resonant Thin-Film Magnetoelectric Sensors

Durdaut, Phillip, Salzer, Sebastian, Reermann, Jens, Robisch, Volker, Hayes, Patrick, Piorra, Andre, Meyners, Dirk, Quandt, Eckhard, Schmidt, Gerhard, Knochel, Reinhard and Hoft, Michael (2017) Thermal-Mechanical Noise in Resonant Thin-Film Magnetoelectric Sensors IEEE Sensors Journal, 17 (8). pp. 2338-2348. DOI 10.1109/JSEN.2017.2671442.

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Supplementary data:


Thin-film magnetoelectric sensors, i.e., composites of magnetostrictive and piezoelectric materials, are able to measure very low magnetic flux densities in the picotesla range. In order to further improve the limit of detection it is of high importance to understand and quantify the relevant noise sources. In this paper, a common model for the deflection noise in vibrational structures is applied to the cantilever structure of resonant magnetoelectric sensors. By means of deflection and noise measurements the existence of thermal-mechanical noise even in sensor structures with a size in the centimeter range is proven. Based on these findings a noise equivalent circuit is suggested which allows not only the distinction between the impact of different sensor-intrinsic noise sources and also the involvement of the preamplifier noise. We found that the thermal-mechanical noise is the dominant noise source if direct signal detection is performed at the first bending resonance frequency of the sensor. However, this kind of noise is not the limiting influence when applying magnetic frequency-conversion techniques.

Document Type: Article
Keywords: Magnetic sensors, Mechanical sensors, Thermal sensors, Magnetoelectric effects, Magnetostriction, Magnetic resonance
Research affiliation: Kiel University > Kiel Marine Science
OceanRep > The Future Ocean - Cluster of Excellence
Kiel University
Refereed: Yes
DOI etc.: 10.1109/JSEN.2017.2671442
ISSN: 1530-437X
Date Deposited: 20 Dec 2017 11:26
Last Modified: 05 Apr 2018 13:05

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