Regensburg 2022 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 38: Electron Theory of Magnetism and Correlations

MA 38.7: Vortrag

Freitag, 9. September 2022, 11:00–11:15, H43

Electric-field control of the exchange interactions — •Svitlana Polesya¹, Sergiy Mankovsky¹, Eszter Simon¹, Alberto Marmodoro², and Hubert Ebert¹ — ¹Dept. Chemistry, LMU Munich, Butenandtstrasse 11, D-81377 Munich, Germany — ²Inst. of Physics, Czech Academy of Sciences, Cukrovarnicka 10, 162 00 Praha 6, Czech Republic

The impact of an applied electric field on the exchange coupling parameters has been investigated based on first-principles electronic structure calculations by means of the KKR Green function method. The calculations have been performed for a Fe monolayer (ML) and for deposited Fe films on different substrates, i.e., metallic (Pt) and semiconducting (GaAs). We analyze the origin of the field-induced change of the exchange interactions J_ij and the features of their field-dependent behavior specific for the studied systems. In particular, rather pronounced changes of J_ij have been found for the Fe/Pt(111) system due to the localized electronic states at the Fe/Pt interface. In the case of Fe/GaAs(001) films we discuss also the dependence of the field-induced modification of J_ij on the thickness of the Fe film. For all studied systems, a strong impact of surface relaxation is found both for the ground-state exchange parameters as well as for their field induced modification.