Tunable Magnetic Phases at Fe3O4/SrTiO3 Oxide Interfaces

• DOI: 10.1021/acsami.8b20625
• Publication Date: 2019-01-24T15:29:31Z
• Authors: Mai Hussein Hamed; Ronja Anika Hinz; Patrick Lömker; Marek Wilhelm; Andrei Gloskovskii; Peter Bencok; Carolin Schmitz-A...; Hebatalla Elnaggar; Claus M. Schneider; Martina Müller
• Keywords: Ferrimagnetism; Stoichiometry; Charge ordering

We demonstrate the emergence and control of magnetic phases between magnetite (Fe3O4), a ferrimagnetic halfmetal, SrTiO3, transparent nonmagnetic insulator considered bedrock oxide-based electronics. The Verwey transition (TV) was detected to persist from bulk-like down ultrathin Fe3O4 films, decreasing 117 ± 4 K (38 nm) 25 (2 nm), respectively. Element-selective electronic properties films buried interfaces are studied by angle-dependent hard X-ray photoelectron spectroscopy circular dichroism techniques. observe reduction Fe2+ ions with film thickness, accompanied an increase Fe3+ in both tetrahedral octahedral sites conclude on formation magnetically active 2 u.c. γ-Fe2O3 intralayer. To manipulate interfacial phase, postannealing process causes controlled that finally leads stoichiometric Fe3O4/SrTiO3(001) heterointerfaces.