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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 18: SrTiO3: A Versatile Material from Bulk Quantum Paraelectric to 2D Superconductor: Poster (joint session TT/KFM/MA/O)
KFM 18.6: Poster
Wednesday, March 20, 2024, 15:00–18:00, Poster E
Boosting the Edelstein effect of two-dimensional electron gases by ferromagnetic exchange — •Gabriel Lazrak1, Annika Johansson2, Börge Göbel2,3, Ingrid Mertig2,3, Agnès Barthélémy1, and Manuel Bibès1 — 1Laboratoire Albert Fert, Université Paris-Saclay, CNRS, Thales, Palaiseau, FRANCE — 2Max Planck Institute of Microstructure Physics, Halle, GERMANY — 3Martin Luther University Halle-Wittenberg, Halle, GERMANY
In this work, we show that making STO 2DEGs ferromagnetic significantly boosts the conversion efficiency of charge and spin currents through direct and inverse Edelstein effects (EE/IEE). Starting from the experimental band structure of non-magnetic SrTiO3 2DEGs, we mimic magnetic exchange coupling by introducing an out-of-plane Zeeman term in a tight-binding model. We then calculate the band structure and spin textures for increasing internal magnetic fields and compute the Edelstein effect using a semiclassical Boltzmann approach. The conversion efficiency initially rises with magnetic field strength, reaching a maximum before declining. This behavior results from the interplay between exchange coupling and the effective Rashba interaction. Our experimental focus is on the 2DEG at the SrTiO3/EuO interface to introduce ferromagnetism into the system.
Keywords: Rashba SOC; Edelstein Effect; Boltzmann calculation; Spin-charge interconversion