Electrically modulated magnetoelectric sensors

Hayes, P., Salzer, S., Reermann, J., Yarar, E., Robisch, V., Piorra, A., Meyners, D., Hoft, M., Knochel, R., Schmidt, Gerhard and Quandt, E. (2016) Electrically modulated magnetoelectric sensors Applied Physics Letters, 108 (18). DOI http://dx.doi.org/10.1063/1.4948470.

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Abstract

Magnetoelectric thin film composites have demonstrated their potential to detect sub-pT magnetic fields if mechanical resonances (typically few hundred Hz to a few kHz) are utilized. At low frequencies (1-100 Hz), magnetic field-induced frequency conversion has enabled wideband measurements with resonance-enhanced sensitivities by using the nonlinear characteristics of the magnetostriction curve. Nevertheless, the modulation with a magnetic field with a frequency close to the mechanical resonance results in a number of drawbacks, which are, e.g., size and energy consumption of the sensor as well as potential crosstalk in sensor arrays. In this work, we demonstrate the feasibility of an electric frequency conversion of a magnetoelectric sensor which would overcome the drawbacks of magnetic frequency conversion. This magnetoelectric sensor consists of three functional layers: an exchange biased magnetostrictive multilayer showing a high piezomagnetic coefficient without applying a magnetic bias field, a non-linear piezoelectric actuation layer and a linear piezoelectric sensing layer. In this approach, the low frequency magnetic signal is shifted into the mechanical resonance of the sensor, while the electric modulation frequency is chosen to be either the difference or the sum of the resonance and the signal frequency. Using this electric frequency conversion, a limit of detection in the low nT/Hz(1/2) range was shown for signals of low frequency. Published by AIP Publishing.

Document Type: Article
Additional Information: Times Cited: 0 Hayes, P. Salzer, S. Reermann, J. Yarar, E. Roebisch, V. Piorra, A. Meyners, D. Hoeft, M. Knoechel, R. Schmidt, G. Quandt, E.
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence
Kiel University
Refereed: Yes
DOI etc.: http://dx.doi.org/10.1063/1.4948470
ISSN: 0003-6951
Projects: Future Ocean
Date Deposited: 27 Feb 2017 08:57
Last Modified: 05 Apr 2018 13:07
URI: http://eprints.uni-kiel.de/id/eprint/36122

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