Two-dimensional electron system at the magnetically tunable EuO/SrTiO${}_3$ interface

Abstract

We create a two-dimensional electron system (2DES) at the interface between EuO, a ferromagnetic insulator, and SrTiO3, a transparent non-magnetic insulator considered the bedrock of oxide-based electronics. This is achieved by a controlled in-situ redox reaction between pure metallic Eu deposited at room temperature on the surface of SrTiO3, an innovative bottom-up approach that can be easily generalized to other functional oxides and scaled to applications. Additionally, we find that the resulting EuO capping layer can be tuned from paramagnetic to ferromagnetic, depending on the layer thickness. These results demonstrate that the simple, novel technique of creating 2DESs in oxides by deposition of elementary reducing agents [T. C. Rödel et al., Adv. Mater. 28, 1976 (2016)] can be extended to simultaneously produce an active, e.g. magnetic, capping layer enabling the realization and control of additional functionalities in such oxide-based 2DESs.

5 pages, 4 figures

References in corpus (17)

• Magnetic effects at the interface between nonmagnetic oxides
• Electric Field Control of the LaAlO${}_3$/SrTiO${}_3$ Interface Ground State
• Tunable Rashba spin-orbit interaction at oxide interfaces
• Unveiling a two-dimensional electron gas with universal subbands at the surface of SrTiO3
• Highly efficient and tuneable spin-to-charge conversion through Rashba coupling at oxide interfaces
• Creation and control of a two-dimensional electron liquid at the bare SrTiO3 surface
• Tailoring the nature and strength of electron-phonon interactions in the SrTiO${}_3$(001) two-dimensional electron liquid
• Observation of Inverse Edelstein Effect in Rashba-Split 2DEG between SrTiO3 and LaAlO3 at Room Temperature
• Universal Fabrication of Two-Dimensional Electron Systems in Functional Oxides
• A Gate-tunable Polarized Phase of Two-Dimensional Electrons at the LaAlO3/SrTiO3 Interface
• Epitaxial and layer-by-layer growth of EuO thin films on yttria-stabilized cubic zirconia (001) using MBE distillation
• Orientational tuning of the Fermi sea of confined electrons at the SrTiO3 (110) and (111) surfaces
• Engineering two-dimensional electron gases at the (001) and (101) surfaces of TiO2 anatase using light
• Prediction of a surface state and a related surface insulator-metal transition for the (100) surface of stochiometric EuO
• Interface Engineering to Create a Strong Spin Filter Contact to Silicon
• 2D surprises at the surface of 3D materials: confined electron systems in transition metal oxides
• Tuning of metal-insulator transition of two-dimensional electrons at parylene/SrTiO${}_3$ interface by electric field

Cited by in corpus (10)

• Metal/SrTiO${}_3$ two-dimensional electron gases for spin-to-charge conversion
• Quantifying the spin mixing conductance of EuO/W heterostructures by spin Hall magnetoresistance experiments
• Imaging the itinerant-to-localized transmutation of electrons across the metal-to-insulator transition in V${}_2$O${}_3$
• Redox-controlled epitaxy and magnetism of oxide heterointerfaces: EuO/SrTiO${}_3$
• Ferroelectric control of spin-polarized two-dimensional electron gas
• Tunable two-dimensional electron system at the (110) surface of SnO${}_2$
• Quantum interference effects of out-of-plane confinement on two-dimensional electron systems in oxides
• Biaxial-stress driven tetragonal symmetry breaking in and high-temperature ferromagnetic semiconductor from half-metallic CrO2
• Tunable 2D Electron- and 2D Hole States Observed at Fe/SrTiO${}_3$ Interfaces
• Orientation-dependent superconductivity and electronic structure of the rare-earth metal/KTaO3 interfaces