Ferromagnetic Two-dimensional Electron Gases with Magnetic Doping and Proximity Effects

Abstract

The advent of magnetic two-dimensional electron gases (2DEGs) at oxide interfaces has provided new opportunities in the field of spintronics. The enhancement of magnetism in 2DEGs at oxide interfaces continues to be a significant challenge, as exemplified by the relatively weak magnetism observed in the classical LaAlO3/SrTiO3 interface. Here, we present ferromagnetic (FM) 2DEGs at the interface fabricated between the FM insulator EuTiO3 (ETO) and the strong spin-orbit coupled (SOC) perovskite insulator KTaO3 (KTO). With the combined effects of magnetic atom doping and magnetic proximity from ETO films, the coercive field of 2DEGs can be significantly enhanced. Magnetoresistance (MR) curve with a high coercive field of 1000 Oe has been observed, in conjunction with a temperature-dependent unambiguous hysteresis loop in the anomalous Hall effect (AHE). Furthermore, within the 2DEGs, we have identified a synergetic interplay between magnetic scattering and the weak antilocalization (WAL) effect on transport. This study provides fresh insights into the formation of FM 2DEGs at ETO/KTO interfaces, and introduce an innovative pathway for creating high-performance magnetic 2DEGs at oxide interfaces.

21 pages and 5 figures

References in corpus (19)

• Magnetic effects at the interface between nonmagnetic oxides
• Tunable Rashba spin-orbit interaction at oxide interfaces
• Interface-driven topological Hall effect in SrRuO${}_3$-SrIrO${}_3$ bilayer
• Weak Antilocalization and Spin Precession in Quantum Wells
• A Universal Critical Density Underlying the Physics of Electrons at the LaAlO3/SrTiO3 Interface
• Discovery of two-dimensional anisotropic superconductivity at KTaO${}_3$ (111) interfaces
• Two-dimensional superconductivity at the surfaces of KTaO3 gated with ionic liquid
• Electrolyte gate-controlled Kondo effect in SrTiO3
• Shubnikov-de Haas oscillations in SrTiO3\LaAlO3 interface
• Electric-field Control of Magnetism with Emergent Topological Hall Effect in SrRuO3 through Proton Evolution
• An alternative to the topological interpretation of the transverse resistivity anomalies in SrRuO3
• Quantization of Hall Resistance at the Metallic Interface between an Oxide Insulator and SrTiO${}_3$
• Controllable thickness inhomogeneity and Berry-curvature-engineering of anomalous Hall effect in SrRuO3 ultrathin films
• Berry phase engineering at oxide interfaces
• Two-channel anomalous Hall effect in SrRuO3
• Strain-tunable Berry curvature in quasi-two-dimensional chromium telluride
• Hump-like structure in Hall signal from SrRuO${}_3$ ultra-thin films without inhomogeneous anomalous Hall effect
• Evolution of ferromagnetism in two-dimensional electron gas of LaTiO3/SrTiO3
• Low temperature magnetoresistance of (111) (La${}_{0.3}$Sr${}_{0.7}$)(Al${}_{0.65}$Ta${}_{0.35}$)/SrTiO${}_3$

Cited by in corpus (1)

• Magnetism and nonlinear charge transport in NiFe2O4/γ-Al2O3/SrTiO3 heterostructure: Toward Spintronic Applications