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MA: Fachverband Magnetismus
MA 49: Focus Session: Higher-Order Magnetic Interactions – Implications in 2D and 3D Magnetism II
MA 49.3: Vortrag
Donnerstag, 19. März 2020, 15:45–16:00, HSZ 04
Beyond Heisenberg exchange: non-collinear formalism for bcc Fe — •A. Szilva1, D. Thonig1, P.F. Bessarab2,3, Y. O. Kvashnin1, D. C. M. Rodrigues1,4, R. Cardias1,4, M. Pereiro1, L. Nordström1, A. Bergman5,6, A. B. Klautau4, and O. Eriksson1,7 — 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 — 3Department of Nanophotonics and Metamaterials, ITMO University, 197101 St. Petersburg, Russia — 4Faculdade de Física, Universidade Federal do Pará, Belém, 66075-110, Brazil — 5Maison de la Simulation, USR 3441, CEA-CNRS-INRIA-Université Paris-Sud-Université de Versailles, F-91191 Gif-sur-Yvette, France — 6INAC-MEM, CEA, F-38000 Grenoble, France — 7School of Science and Technology, Örebro University, SE-701 82 Örebro, Sweden
The orbital resolved LKAG exchange calculations show that an entirely different microscopic mechanisms work in the T2g than in the Eg (and "mixed") orbitals in bcc Fe. Study of interatomic exchange parameters in a non-collinear framework, which parameters can be interpreted as higher order spin terms, too, is in line with these findings: the nearest-neighbor exchange parameters related to the T2g orbitals are essentially Heisenberg-like, ie., they do not depend on the underlying spin-configuration. In contrary, in the Eg and mixed channels strong configuration dependence can be found when one spin is fully rotated in a ferromagnetic background. The presentation is mostly based on the results published on Ref Phys. Rev. B 96 (14), 144413 (2017).