Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 43: Focus Session: Higher-Order Magnetic Interactions – Implications in 2D and 3D Magnetism I

MA 43.3: Invited Talk

Thursday, March 19, 2020, 10:30–11:00, HSZ 04

Topological-chiral magnetic interactions driven by emergent orbital magnetism — •S. Grytsiuk¹, J.-P. Hanke¹, M. Hoffmann¹, J. Bouaziz¹, O. Gomonay², G. Bihlmayer¹, S. Lounis¹, Y. Mokrousov^1,2, and S. Blügel¹ — ¹Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany — ²Institute of Physics, Johannes Gutenberg University Mainz, 55099 Mainz, Germany

Based on microscopic arguments and a systematic total energy expansion, further validated by electronic structure calculations, we discover a new class of magnetic interactions of chiral nature originating from the so-called topological orbital moment (TOM) of electrons in non-coplanar magnets [1]. The TOMs, L^TO, emerge from the scalar spin chirality of three magnetic moments, S_i·(S_j× S_k) . As a result of a six-spin– or a four-spin interaction, they can interact with each other and interact with the spins of the underlying lattice. In the context of B20-type chiral magnet MnGe, these novel interactions can dominate over the Dzyaloshinskii-Moriya interaction in selecting the chiral ground state, providing possibly a key for solving the open question of the recently observed complex 3D magnetic structures. By providing a mechanism for the physical realization of the Faddeev model with hopfion solutions, topological-chiral interactions might play a key role in triggering the formation of 3D magnetic solitons without the assistance of an external magnetic field.
[1] S. Grytsiuk et al., Nature Comm., accepted (2019); ArXiv:1904.02369