SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 73: Mini-Symposium: Dzyaloshinskii-Moriya Interaction (DMI) in magnetic layered systems II
O 73.2: Vortrag
Mittwoch, 3. März 2021, 14:00–14:20, R3
Prospecting chiral multi-site interactions in prototypical magnetic systems — •Manuel dos Santos Dias1, Sascha Brinker1, and Samir Lounis1,2 — 1Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany — 2Faculty of Physics, University of Duisburg-Essen, 47053 Duisburg, Germany
Atomistic spin models can successfully explain the properties of magnetic materials once the relevant magnetic interactions are identified. Recently, new types of chiral interactions that generalize the Dzyaloshinskii-Moriya interaction have been proposed [1,2,3,4]. Here, we present a systematic construction of a generalized spin model containing isotropic and chiral multi-site interactions, motivated by a microscopic model, and their symmetry properties are established. We show that the chiral interactions arise solely from the spin-orbit interaction and that the multi-site interactions do not have to follow Moriya’s rules, unlike the Dzyaloshinskii-Moriya interaction [1,4]. We then report on density functional theory calculations for prototypical magnetic systems, Cr, Mn, Fe and Co trimers and tetrameters on the Re(0001), Pt(001), Pt(111) and Au(111) surfaces. The multi-site interactions are substantial in magnitude and cannot be neglected when comparing the energy of different magnetic configurations.
[1] S. Brinker, M. dos Santos Dias and S. Lounis, New J Phys 21, 083015 (2019); [2] A. Lászlóffy et al., Phys Rev B 99, 184430 (2019); [3] S. Grytsiuk et al., Nat Commun 11, 511 (2020); [4] S. Brinker, M. dos Santos Dias and S. Lounis, Phys Rev Research 2, 033240 (2020)