Controlling spin-polarized carriers at the SrTiO₃ /EuO interface via the ferroelectric field effect

Using first principle calculations, we investigate the magneto-electric field effect at the SrTiO₃/EuO interface in the BaTiO₃/SrTiO₃/EuO heterostructure. The spontaneous polarization in tetragonal BaTiO₃ is demonstrated to control the movement of the two-dimensional electron gas in SrTiO₃ across the interface with ferromagnetic EuO as well as induce spin polarized two-dimensional hole gas and influence the electronic structure at this interface. We also investigate the effect of oxygen vacancy in SrTiO₃ near the SrTiO₃/EuO interface. To investigate the ferroelectric polarization morphology, we use the phenomenological Landau-Khalatnikov model and compare it with the results of first principle calculations.