Regensburg 2022 – scientific programme
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MA: Fachverband Magnetismus
MA 15: Computational Magnetism 2
MA 15.2: Talk
Tuesday, September 6, 2022, 09:45–10:00, H48
An ab-initio parameterised spin model of hematite — •Tobias Dannegger1, András Deák2, Shubhankar Das3, E. F. Galindez Ruales3, Eunchong Baek3, Mathias Kläui3, László Szunyogh2,4, and Ulrich Nowak1 — 1Department of Physics, University of Konstanz — 2Department of Theoretical Physics, Institute of Physics, Budapest University of Technology and Economics — 3Institute of Physics, Johannes Gutenberg University Mainz — 4MTA-BME Condensed Matter Research Group, Budapest University of Technology and Economics
The canted antiferromagnetic insulator hematite, known for motivating the theory of the Dzyaloshinskii–Moriya interaction [1, 2] as well as the first description of the Morin transition [3], is of interest in modern antiferromagnetic spintronics because of its long-distance spin transport properties [4]. We present an ab-initio parameterised atomistic spin model of hematite that accurately reproduces its magnetic properties and phase transitions, and shows how dipole-dipole interactions play an important role in determining the transition between the antiferromagnetic and weak ferromagnetic phase. We compare our model’s predictions with extensive experimental measurements on a hematite single crystal and find good quantitative agreement across a wide range of temperatures.
[1] I. Dzyaloshinskii, J. Phys. Chem. Solids 50, 241 (1958).
[2] T. Moriya, Phys. Rev. 120, 91 (1960).
[3] F. J. Morin, Phys. Rev. 78, 819 (1950).
[4] R. Lebrun et al., Nature 561, 222 (2018).