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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.