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/[Formula: see text], 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.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Kittmann A,Durdaut P,Zabel S,Reermann J,Schmalz J,Spetzler B,Meyners D,Sun NX,McCord J,Gerken M,Schmidt G,Höft M,Knöchel R,Faupel F,Quandt Edoi
10.1038/s41598-017-18441-4subject
Has Abstractpub_date
2018-01-10 00:00:00pages
278issue
1issn
2045-2322pii
10.1038/s41598-017-18441-4journal_volume
8pub_type
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