Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 56: Multiferroics and Magnetoelectric coupling II (joint session MA/KFM)
MA 56.6: Vortrag
Freitag, 5. April 2019, 10:45–11:00, H39
Vacuum encapsulated high frequency magnetic field sensors based on the ΔE effect — •Benjamin Spetzler1, Florian Niekiel2, Fabian Lofink2, Bernhard Wagner2, and Franz Faupel1 — 1Kiel University, Kiel, Germany — 2Fraunhofer ISIT, Itzehoe, Germany
Investigations into the ΔE effect of magnetoelastic materials have revealed the exciting promise of detecting low frequency and small amplitude magnetic fields [1]. Typical approaches are based on electrically exciting a resonator by applying an alternating voltage to a magnetoelectric composite structure with soft magnetic properties [2]. Previously presented sensors are operated either in the first or second bending mode with resonance frequencies in the lower kHz regime [3]. Due to the low resonance frequencies and comparatively large quality factors, the bandwidth of these sensors is too small for many biomedical applications. Here, we present vacuum encapsulated cantilever resonators operating at high frequency modes with bandwidths in the kHz regime. In addition to common bending modes, longitudinal and more complex modes are also used. The various modes are analyzed experimentally and theoretically for sensitivity, detection limit, mechanical properties and loss mechanisms with a comprehensive magneto-electromechanical model. Important consequences for future sensor designs are derived.
[1] B. Gojdka, et al., APL, 99 (22), (2011)
[2] S. Zabel, et al., APL, 107 (15), (2015)
[3] J. Reermann, et al., IEEE Sensors, 16 (12), (2016)