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MA: Fachverband Magnetismus

MA 57: Posters Magnetism II

MA 57.10: Poster

Donnerstag, 19. März 2020, 15:00–18:00, P3

Trends of higher-order exchange interactions in transition metal trilayers — •Mara Gutzeit, Soumyajyoti Haldar, and Stefan Heinze — Institute of Theoretical Physics and Astrophysics, University of Kiel, Leibnizstrasse 15, 24098 Kiel, Germany

Higher-order exchange interactions (HOI) beyond the pair-wise Heisenberg exchange can play a crucial role in the formation of the magnetic ground state of a system. Prominent examples are both Rh/Fe atomic bilayers on Ir(111) [1] and a monolayer Fe on Rh(111) [2] which are shown to exhibit a double-row-wise antiferromagnetic (↑↑↓↓) ground state stabilized by HOI. Here, employing density functional theory as implemented in the FLEUR and VASP code, we investigate the behaviour of HOI in magnetic trilayer systems. Choosing the above-mentioned Rh/Fe/Ir system as a starting point, we systematically study how the HOI change not only with the band filling as Rh (Ir) is replaced by other elements of the 4d (5d) series but also how they are affected by different stackings of the involved transition metals. Additionally, trends for HOI parameters are presented for the case that the central 3d element Fe is replaced by Co. Finally, the values obtained for the biquadratic exchange, the four-site-four-spin term and the three-site-four-spin interaction of the trilayers are compared with values calculated for respective ultrathin film systems.

[1] Romming et al. PRL 120, 207201 (2018)

[2] Krönlein et al. PRL 120, 207202 (2018)