SKM 2021 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 18: Posters Magnetism V

MA 18.25: Poster

Freitag, 1. Oktober 2021, 10:00–13:00, P

Exchange interactions in hematite from first principles — •András Deák¹, Tobias Dannegger², Martin Evers², László Szunyogh^1,3, and Ulrich Nowak² — ¹Department of Theoretical Physics, Budapest University of Technology and Economics, Hungary — ²Fachbereich Physik, Universität Konstanz, Germany — ³MTA-BME Condensed Matter Research Group, Budapest University of Technology and Economics, Hungary

Antiferromagnets have lately appeared in the forefront of spintronics research, with exciting novel magnonic spin transport applications for collinear insulating antiferromagnets. We will detail our investigations of hematite (α-Fe₂O₃), a well-known collinear insulating antiferromagnet showing weak ferromagnetism.

We assess magnetic ordering in the material using the Screened Korringa–Kohn–Rostoker (SKKR) multiple scattering theory. We use a multiscale description by deriving spin model parameters from first principles and investigating the ground state spin configuration and its stability using this model. With this approach we can tackle the nature of the weak ferromagnetic distortion in this antiferromagnet, and provide spin model parameters that can be used in large-scale simulations of magnon dynamics effects.