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SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 41: Focus Session: Altermagnetism: Transport, Optics, Excitations

MA 41.7: Hauptvortrag

Donnerstag, 30. März 2023, 17:30–18:00, HSZ 02

Insight into chemical and magnetotransport properties of epitaxial α-Fe2O3/Pt bilayers — •Anna Kozioł-Rachwał1, Natalia Kwiatek2, Witold Skowroński3, Krzysztof Grochot3, Jarosław Kanak3, Ewa Madej2, Kinga Freindl2, Józef Korecki2, and Nika Spiridis21Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Mickiewicza 30, 30-059 Kraków, Poland — 2Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, 30-239 Kraków, Poland — 3Institute of Electronics, AGH University of Science and Technology, Mickiewicza 30, 30-059 Kraków, Poland

Recently a spin Hall magnetoresistance (SMR) was presented for Pt/α-Fe2O3(hematite) bilayer.[1],[2] In our studies we investigated the chemical structure and SMR in epitaxial α-Fe2O3(0001)/Pt(111) bilayers with hematite layers grown by molecular beam epitaxy on a MgO(111) substrate.[3] We observed a sign change of the SMR from positive to negative when the thickness of the hematite increased from 6 to 15 nm. For α-Fe2O3(15 nm)/Pt, we demonstrated room-temperature switching of the Néel order with rectangular, nondecaying switching characteristics. Such structures open the way to extending magnetotransport studies to more complex systems with double asymmetric metal/hematite/Pt interfaces. [1] J. Fischer et al. Phys. Rev. Applied 13, 014019 (2020). [2] Y. Cheng et al. Phys. Rev. Lett. 124, 027202 (2020). [3] A. Kozioł-Rachwał et al., Phys. Rev. B 106, 104419 (2022).

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