SKM 2021 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 11: Posters Magnetism III
MA 11.24: Poster
Mittwoch, 29. September 2021, 13:30–16:30, P
Strain effect in the anomalous Hall effect of SrRuO3 thin films : a first principles study — •Kartik Samanta1, Marjana Ležaić2, Stefan Blügel2, and Yuriy Mokrousov2 — 1Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany — 2Peter Grunberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany
We investigate the effect of strain-induced oxygen octahedral distortion in the electronic structure and anomalous Hall response of the ferromagnetic SrRuO3(SRO) ultra-thin films by virtue of density functional theory calculations. We find a strong deformation of the oxygen octahedra (RuO6) with an increasing amount of substrate induced compressive strain. Our Berry curvature calculations predict a positive value of the anomalous Hall conductivity of +76 S/cm at -1.7% strain, whereas it is found to be negative (-156 S/cm) at -0.47% strain. We attribute the observed behavior of the anomalous Hall effect to the nodal point dynamics in the electronic structure arising in response to tailoring the oxygen octahedral distortion driven by the substrate induced strain. Our calculation of the strain-mediated anomalous Hall conductivity as a function of reduced magnetization obtained by scaling down the magnitude of the exchange field inside Ru atoms, shows a good qualitative agreement with experimental observations, which indicates a strong impact of longitudinal thermal fluctuations of Ru spin moments on the anomalous Hall effect in this system.