Tunable ferromagnetic 2D electron gases at the oxide interface: LaTiO₃/EuTiO₃

Two-dimensional electron gases (2DEGs) with emergent ferromagnetism attracts lots of attention because of the added spin-degree of freedom and their potential for functional applications. Here, we investigate the ferromagnetic 2DEGs formed at the heterostructure of a polar-antiferromagnetic LaTiO₃ on a non-polar antiferromagnetic oxide EuTiO₃. These heterostructures show robust ferromagnetism in magneto-transport measurements. We discuss the possible mechanisms of the emergent magnetic orderings. Anomalous Hall effects with hump-like behavior are also observed in particular samples, sensitive to the exact growth conditions. The magnetism in this system is highly tunable. Our results may lead to a new route to controlling emergent magnetic properties at the oxide interfaces and broadening their applications as functional magnetic devices.