Abstract

We present a comprehensive study of a magnetic sensor system that benefits from a new technique to substantially increase the magnetoelastic coupling of surface acoustic waves (SAW). The device uses shear horizontal acoustic surface waves that are guided by a fused silica layer with an amorphous magnetostrictive FeCoSiB thin film on top. The velocity of these so-called Love waves follows the magnetoelastically-induced changes of the shear modulus according to the magnetic field present. The SAW sensor is operated in a delay line configuration at approximately 150 MHz and translates the magnetic field to a time delay and a related phase shift. The fundamentals of this sensor concept are motivated by magnetic and mechanical simulations. They are experimentally verified using customized low-noise readout electronics. With an extremely low magnetic noise level of ≈100 pT/\[\sqrt{{\rm{Hz}}}\], a bandwidth of 50 kHz and a dynamic range of 120 dB, this magnetic field sensor system shows outstanding characteristics. A range of additional measures to further increase the sensitivity are investigated with simulations.

Details

Title
Wide Band Low Noise Love Wave Magnetic Field Sensor System
Author
Kittmann, Anne 1 ; Durdaut, Phillip 2   VIAFID ORCID Logo  ; Zabel, Sebastian 1 ; Reermann, Jens 2 ; Schmalz, Julius 2 ; Spetzler, Benjamin 1 ; Meyners, Dirk 1 ; Sun, Nian X 3   VIAFID ORCID Logo  ; McCord, Jeffrey 1 ; Gerken, Martina 2   VIAFID ORCID Logo  ; Schmidt, Gerhard 2 ; Höft, Michael 2   VIAFID ORCID Logo  ; Knöchel, Reinhard 2 ; Faupel, Franz 1 ; Quandt, Eckhard 1 

1  Institute for Materials Science, Kiel University, Kiel, Germany 
2  Institute of Electrical Engineering and Information Technology, Kiel University, Kiel, Germany 
3  W.M. Keck Laboratory for Integrated Ferroics, Electrical and Computer Engineering Department, Northeastern University, Boston, Massachusetts, USA 
First page
1
Publication year
2018
Publication date
Jan 2018
Publisher
Nature Publishing Group
e-ISSN
20452322
Source type
Scholarly Journal
Language of publication
English
DOI
https://doi.org/10.1038/s41598-017-18441-4
ProQuest document ID
1993418905
Copyright
© 2017. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.