Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 51: Magnetism Poster B
MA 51.68: Poster
Donnerstag, 4. April 2019, 15:00–18:00, Poster C
Theory of noncollinear interactions beyond Heisenberg exchange — •Attila Szilva1, Danny Thonig1, Pavel Bessarab2, Yaroslav O. Kvashnin1, Debora C. M. Rodrigues3, Ramon C. Cardias3, Manuel Pereiro1, Lars Nordström1, Anders Bergman1, Anagela B. Klautau3, and Olle Eriksson4 — 1Department of Physics and Astronomy, Division of Materials Theory, Uppsala University, Box 516, SE-75120 Uppsala, Sweden — 2Science Institute of the University of Iceland, 107 Reykjavik, Iceland, Department of Nanophotonics and Metamaterials, ITMO University, 197101 St. Petersburg, Russia — 3Department of Physics and Astronomy, Division of Materials Theory, Uppsala University, Box 516, SE-75120 Uppsala, Sweden, Faculdade de Física, Universidade Federal do Pará, Belém, 66075-110, Brazil — 4Department of Physics and Astronomy, Division of Materials Theory, Uppsala University, Box 516, SE-75120 Uppsala, Sweden, School of Science and Technology, Örebro University, SE-701 82 Örebro, Sweden
We show for a simple noncollinear configuration of the atomistic spins (in particular, where one spin is rotated by a finite angle in a ferromagnetic background) that the pairwise energy variation computed in terms of multiple-scattering formalism cannot be fully mapped onto a bilinear Heisenberg spin model even in the absence of spin-orbit coupling. An Eg T2g symmetry analysis based on the orbital decom- position of the exchange parameters in bcc Fe leads to the conclusion that the nearest-neighbor exchange parameters related to the T2g or- bitals are essentially Heisenberg-like.