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MA: Fachverband Magnetismus

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

MA 43.8: Vortrag

Donnerstag, 19. März 2020, 12:30–12:45, HSZ 04

First-principles multispin interactions and their impact on magnetic properties — •Sergiy Mankovsky, Svitlana Polesya, Alberto Marmodoro, Eszter Simon, and Hubert Ebert — Dept. Chemistry, LMU Munich, Butenandtstrasse 11, D-81377 Munich, Germany

We discuss the impact of interatomic exchange interactions on magnetic properties beyond the classical Heisenberg model. These extensions include the Dzyaloshinskii-Moriya interaction (DMI), biquadratic (chiral and non-chiral), three-spin and four spin interaction, which can be calculated from first principles on the basis of the fully relativistic Korringa-Kohn-Rostoker (KKR) Green function method. In particular, the role of the non-chiral biquadratic interactions will be discussed in connection to the spin-wave stiffness and critical temperature of magnetic materials. We will discuss also the impact of the higher-order chiral exchange interactions on the formation of skyrmion magnetic structures which is often attributed to the effect of the DMI competing with the isotropic exchange and external magnetic fields. We will discuss also the possibility of an external electric field to tune the exchange interactions with an emphasis on the DMI, and accordingly discuss its impact on the Skyrmion formation.