SKM 2021 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 14: Focus Session: Higher-Order Magnetic Interactions - Implications in 2D and 3D Magnetism II

MA 14.5: Vortrag

Donnerstag, 30. September 2021, 14:45–15:00, H5

Dzyaloshinskii-Moriya Interaction revisited — •Hiroshi Katsumoto and Stefan Blügel — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

In recent years, the Dzyaloshinskii-Moriya interaction (DMI) has received enormous attention. New materials, new physical issues, and new measurement methods have led to new questions. E.g., recent theoretical studies have proposed higher-order interaction terms for this DMI [1]. Introduced by Dzyaloshinskii [2] on the basis of phenomenological and group-theoretical arguments in combination with classical axial vectors and substantiated by Moriya [3] for the first time microscopically based on the quantum mechanical spin-orbit interaction, in systems where the inversion symmetry is locally broken, the DMI affects the magnetic properties. We reiterate the cause of weak ferromagnetism in centrosymmetric materials and investigate the relationship between the Lifshitz invariant associated with macroscopic chiral symmetry breaking and microscopic DMI. We will discuss how to uniquely write down the interaction term in the spin Hamiltonian from the irreducible representation depending on the size of the spin.

We acknowledge funding from the DARPA TEE program through grant MIPR (#HR0011831554) from DOI, and Deutsche Forschungsgemeinschaft (DFG) through SPP-2137 and SFB-1238 (project C1).

[1] S. Brinker, et al., New J. Phys. 21, 083015 (2019).

[2] I.E. Dzialoshinskii, Sov. Phys. JETP 5, 1259 (1957).

[3] T. Moriya, Phys. Rev. 120, 91 (1960).