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Tunable magnetic phases at Fe 3 O 4 /SrTiO 3 oxide interfaces

DOI: 10.1021/acsami.8b20625 DOI Help

Authors: Mai Hussein Hamed (Peter-Grünberg-Institut (PGI-6), Forschungszentrum Jülich GmbH; Helwan University) , Ronja Anika Hinz (Peter-Grünberg-Institut (PGI-6), Forschungszentrum Jülich GmbH) , Patrick Lomker (Peter-Grünberg-Institut (PGI-6), Forschungszentrum Jülich GmbH) , Marek Wilhelm (Peter-Grünberg-Institut (PGI-6), Forschungszentrum Jülich GmbH) , Andrei Gloskovskii (Deutsches Elektronen-Synchrotron DESY) , Peter Bencok (Diamond Light Source) , Carolin Schmitz-antoniak (Peter-Grünberg-Institut (PGI-6), Forschungszentrum Jülich GmbH) , Hebatalla Elnaggar (Debye Institute for Nanomaterials Science) , Claus M. Schneider (Peter-Grünberg-Institut (PGI-6), Forschungszentrum Jülich GmbH; Fakultät für Physik and Center for Nanointegration Duisburg-Essen (CeNIDE)) , Martina Muller (Peter-Grünberg-Institut (PGI-6), Forschungszentrum Jülich GmbH; Universität Dortmund)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acs Applied Materials & Interfaces

State: Published (Approved)
Published: January 2019
Diamond Proposal Number(s): 16202

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

Subject Areas: Materials, Physics


Instruments: I10-Beamline for Advanced Dichroism