Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 30: Functional Antiferromagnetism
MA 30.5: Vortrag
Mittwoch, 11. März 2026, 10:30–10:45, POT/0151
Impact of deposition parameters on magnonic properties of α-Fe2O3 thin films. — •Katharina Müller1,2, Tobias Herrlich1,2, Monika Scheufele1,2, Matthias Opel1, Hans Huebl1,2,3, Rudolf Gross1,2,3, Akashdeep Kamra4, Matthias Althammer1,2, and Stephan Geprägs1 — 1Walther-Meißner-Institut, BAdW, Garching, Germany — 2TUM School of Natural Sciences, Munich, Germany — 3Munich Center for Quantum Science and Technology, Munich, Germany — 4Department of Physics and Research Center OPTIMAS, RPTU Kaiserslautern-Landau, Kaiserslautern, Germany
Magnons in magnetic insulators are promising spin information carriers in future spintronic devices. For such applications, investigating and understanding the magnonic properties of thin films is crucial. Among the antiferromagnetic insulators, α-Fe2O3 is a prime example to study. Upon cooling, it features a Morin transition at 263 K from an antiferromagnetic easy-plane to an easy-axis phase below the Néel temperature. We obtain the magnetic anisotropy, the Dzyaloshinskii-Moriya interaction, as well as the magnon decay length from the magnon Hanle effect in all-electrical magnon transport experiments [1]. We study the dependence of these properties on the deposition parameters of α-Fe2O3 thin films grown on differently oriented Al2O3-substrates. Starting from a multi-domain state and driving the system with an external magnetic field, we use spin Hall magnetoresistance measurements to assess how the monodomainization field is influenced by the deposition parameters. [1] M.Scheufele et al., APL Mater. 11, 091115 (2023).
Keywords: Magnonics; Hematite; Magnetoresistance; Spin Current; Antiferromagnet