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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)