Regensburg 2025 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 9: Altermagnets I
MA 9.12: Vortrag
Montag, 17. März 2025, 18:00–18:15, H20
Magnetic domain features in the altermagnetic Mn5Si3 — •Gregor Skobjin1, Javier Rial2, Sebastian Beckert3, Helena Reichlová3,4, Andy Thomas3,5, Vincent Baltz2, Lisa Michez6, Richard Schlitz1, Michaela Lammel1, and Sebastian T.B. Goennenwein1 — 1Department of Physics, University of Konstanz, Germany — 2Université Grenoble Alpes, CNRS, CEA, IRIG-Spintec, France — 3IFMP, TU Dresden, Germany — 4Institute of Physics ASCR, Czech Republic — 5Aix-Marseille Université, CNRS, CINaM, France — 6IFW Dresden, Germany
Altermagnets are an intriguing novel class of magnetic materials. We exploit the anomalous Hall effect response of micropatterned Mn5Si3 thin films to investigate their magnetization relaxation behavior. In experiments at T < 200 K i.e., in the altermagnetic phase, and for magnetic fields for which the samples exhibit large magnetic susceptibility, we observe a strong magnetic aftereffect as well as Barkhausen-like steps in the time-dependent Hall voltage evolution. More specifically, we recorded the evolution of the Hall voltage in micropatterned Hall bars with widths of 10 microns down to 0.1 microns at a series of different magnetic field magnitudes to gain insights into potential domain effects in the altermagnetic phase of Mn5Si3. We critically analyze our experimental results and discuss implications for the micromagnetic structure of altermagnetic thin films.
Keywords: Magnetization Relaxation; Anomalous Hall Effect; Barkhausen Effect; Altermagnetism; Thin films