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SKM 2021 – scientific programme

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MA: Fachverband Magnetismus

MA 18: Posters Magnetism V

MA 18.25: Poster

Friday, October 1, 2021, 10:00–13:00, P

Exchange interactions in hematite from first principles — •András Deák1, Tobias Dannegger2, Martin Evers2, László Szunyogh1,3, and Ulrich Nowak21Department 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.

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