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MA: Fachverband Magnetismus

MA 35: Poster 2

MA 35.62: Poster

Donnerstag, 8. September 2022, 16:00–18:00, P4

Origin of magnetic loss and noise in magnetoelastic magnetic field sensors — •Elizaveta Golubeva¹, Benjamin Spetzler², Franz Faupel¹, and Jeffrey McCord¹ — ¹Kiel University, Kiel, Germany — ²Technical University Ilmenau, Ilmenau, Germany

Magnetoelastic magnetic field sensors based on the delta-E effect have proven their high potential for detecting small-amplitude and low-frequency magnetic fields. The concept of such sensors evolves from the dependency of the stiffness tensor on the applied magnetic field and can be utilized in various device configurations, including surface acoustic wave sensors and composite cantilevers. Previous research has shown that the main factor limiting the performance of such sensors comes from the sensor's intrinsic noise. However, the challenge of quantifying different noise sources has not been resolved yet. In this work, we suggest a general methodology for estimating the magnetic noise in magnetoelectric delta-E-effect sensors. Here, we present a complete physical device model and experimental analysis at the example of a millimeter-sized cantilever sensor. In this case, the magnetic noise associated with the hysteresis loss dominates the sensor performance and determines a minimal detectable field for the sensor of about 300 pT/Hz^1/2 @ 10 Hz. The described principles can also be applied to other magnetoelastic magnetic field sensors.

This work was funded by the German Research Foundation (DFG) through the Collaborative Research Centre CRC 1261 "Magnetoelectric Sensors - From Composite Materials to Biomagnetic Diagnostics" and the Carl-Zeiss Foundation via the Project MemWerk.