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MA: Fachverband Magnetismus

MA 40: Poster Magnetism II

MA 40.48: Poster

Donnerstag, 30. März 2023, 14:00–16:00, P2/EG

Single magnetic domain magnetoelectric composites for picotesla field sensing — •Dennis Seidler, Patrick Hayes, Lars Thormählen, Dirk Meyners, Eckhard Quandt, and Jeffrey McCord — Kiel University, Institute for Materials Science, Kaiserstraße 2, 24143 Kiel, Germany

The contactless measurement of biomagnetic signals i.e., magnetocardiography or magnetoencephalography at ambient conditions has gained high interest for medical applications. Magnetoelectric (ME) cantilever-based field sensors have shown promising results in that regard [1]. To achieve the necessary limit of detection (LOD) a minimization of all noise sources has to be performed. Magnetic noise mainly results from magnetic domain wall activity during sensor operation. We demonstrate a single-domain thick magnetic multilayer stack, to minimize the magnetic noise in the ME sensors. The multilayer is prepared via sputter deposition in an applied magnetic field. We utilize a scalable approach based on magneto-statically coupled (Fe₉₀Co₁₀)₇₈Si₁₂B₁₀ layers, with the magnetic sensitive layer showing single domain behavior while still achieving high field sensitivity. Integrated in converse ME composite sensors, we obtain a LOD of 40 pT·Hz^−0.5 at 10 Hz.
This work was funded by the German Research Foundation (DFG) through the Collaborative Research Centre CRC 1261.
[1] P. Hayes, M. Jovičević Klug, S. Toxværd, P. Durdaut, V. Schell, A. Teplyuk, D. Burdin, A. Winkler, R. Weser, Y. Fetisov, M. Höft, R. Knöchel, J. McCord, and E.Quandt, Sci Rep. 9, 16355 (2019)