Dresden 2020 – scientific programme

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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: Talk

Thursday, March 19, 2020, 15:45–16:00, HSZ 04

Beyond Heisenberg exchange: non-collinear formalism for bcc Fe — •A. Szilva¹, D. Thonig¹, P.F. Bessarab^2,3, Y. O. Kvashnin¹, D. C. M. Rodrigues^1,4, R. Cardias^1,4, M. Pereiro¹, L. Nordström¹, A. Bergman^5,6, A. B. Klautau⁴, and O. Eriksson^1,7 — 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).