SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 49: Magnetic Information Technology, Recording, Sensing
MA 49.4: Vortrag
Freitag, 31. März 2023, 10:15–10:30, HSZ 403
Magnetic noise theory of magnetoelastic magnetic field sensors — •Elizaveta Spetzler1, Benjamin Spetzler2, and Jeffrey McCord1 — 1Institute for Materials Science, Kiel University, Kiel, Germany — 2Department of electrical engineering and information technology, Technical University Ilmenau, Ilmenau, Germany
Intrinsic magnetic noise currently limits the performance of many magnetoelastic magnetic field sensors. Therefore, understanding and estimating the magnetic noise level is crucial for further sensor improvement. This work reviews the theory of thermal-magnetic noise in general and discusses additional magnetic noise sources relevant to magnetoelastic magnetic field sensors. We highlight the limitations and assumptions of previous approaches and develop important model extensions. We demonstrate and quantify the strong connection between magnetic sensitivity, loss, and noise by implementing the magnetic noise description in a multilevel model of a magnetoelastic magnetic field sensor based on the ΔE effect. The excellent match of simulations and measurements reveals a significant influence of the fundamental nonlinearity of the ΔE effect on the sensor performance. While the model is applied to ΔE effect sensors, many of the results are also valid for other magnetic field sensors and magnetoelastic modulated devices.
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.