Berlin 2024 – scientific programme
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MA: Fachverband Magnetismus
MA 47: Poster III
MA 47.23: Poster
Thursday, March 21, 2024, 15:00–18:00, Poster D
Vortex-based magnetic field sensors characterised by in-plane and out-of-plane magnetic fields — •Sophie Knewitz1, Giovanni Masciocchi1,2, Johannes Paul2, Mathias Kläui1, and Angela Wittmann1 — 1Johannes Gutenberg-Universität, Mainz, Germany — 2Sensitec GmbH, Mainz, Germany
Magnetic sensors are indispensable for several everyday applications, due to their ability to measure speed, position, and orientation by means of magnetic fields [1]. Vortex-based magnetic field sensors can exhibit higher performance compared to conventional magnetic sensors due to hysteresis-free behaviour and low noise levels [2]. For developing them, it is essential to know about the spin structures’ behaviour.
This project investigates the in-plane (IP) and out-of-plane (OOP) field sensitivity of circular vortex-based sensors. Using tunnel magnetoresistance, hysteresis curves of the samples are measured with a 2D vector magnet for varying OOP magnetic fields. We find that the magnetic vortex devices are remarkably robust against OOP fields up to at least 175 mT. Additionally, the hysteresis curves are sensitive to small misalignment of the sample with respect to the field axis. This implies careful characterisation is paramount for ensuring comparability.
These features, robustness in OOP fields and sensitivity to angular displacement, are very advantageous for IP sensors by facilitating accurate measurements of IP fields and detecting angular deviations.
References
[1] Jogschies, et al. Sensors 15.11, 28665-28689 (2015).
[2] Suess, et al. Nature Electronics 1.6, 362-370 (2018).
Keywords: Magnetic vortices; Magnetic sensors