Interfacial Spin–Orbit-Coupling-InducedStrongSpin-to-Charge Conversion at an All-Oxide Ferromagnetic/Quasi-Two-DimensionalElectron Gas Interface

Functional oxides and hybrid structures with interfacial spin–orbit coupling and the Rashba–Edelstein effect (REE) are promising materials systems for thermal tolerance spintronic device applications. Here, we demonstrate efficient spin-to-charge conversion through enhanced interfacial spin–orbit coupling at the all-oxide interface of La_1–<i>x</i>Ca_<i>x</i>MnO₃ with quasi-two-dimensional (quasi-2D) SrTiO₃ (LCMO/STO). The quasi-2D interface is generated via oxygen vacancies at the STO surface. We obtain a spin-to-charge conversion efficiency of θ_∥ ≈ 2.32 ± 1.3 nm, most likely originating from the inverse REE, which is relatively large versus all-metallic spin-to-charge conversion materials systems. The results highlight that the LCMO/STO 2D electron gas is a potential platform for spin-based memory and transistor applications.