Regensburg 2025 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 15: Poster I

MA 15.18: Poster

Dienstag, 18. März 2025, 10:00–12:30, P1

Impact of sample dimensions on the anomalous Hall effect response — •Dominik Vogel, Denise Reustlen, Sebastian Sailler, Gregor Skobjin, Michaela Lammel, Richard Schlitz, and Sebastian T. B. Goennenwein — Fachbereich Physik, Universität Konstanz, Konstanz, Germany

The anomalous Hall effect (AHE) enables an electrical detection of the magnetization in ferromagnetic conductors. In typical AHE measurements, the voltage transverse to both the applied charge current and magnetic field is detected. Recording this voltage as a function of magnetic field strength and polarity allows one to infer the magnetic hysteresis loop of a given magnetic microstructure. However, the absolute magnitude of the AHE voltage characteristically scales with the sample dimensions. In particular, the smaller the width w of the respective studied Hall bar microstructure, the smaller the Hall voltage signal for constant current density. In order to establish the minimal sample dimensions required for a detectable AHE signal, we have systematically varied the dimensions of Hall bar microstructures patterned into thin Co/Pt multilayers with perpendicular magnetic anisotropy and measured their Hall response as a function of field magnitude and current density. We critically discuss the scaling of the Hall voltage with sample dimensions observed and its implications for Hall effect-based experiments in magnetic nanostructures.

Keywords: anomalous Hall effect; microstructure; thin film; ferromagnet; perpendicular magnetic anisotropy