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Tunable Magnetic Phases at Fe3O4/SrTiO3 Oxide Interfaces.
Hamed, Mai Hussein; Hinz, Ronja Anika; Lömker, Patrick; Wilhelm, Marek; Gloskovskii, Andrei; Bencok, Peter; Schmitz-Antoniak, Carolin; Elnaggar, Hebatalla; Schneider, Claus M; Müller, Martina.
Afiliação
  • Hamed MH; Peter-Grünberg-Institut (PGI-6) , Forschungszentrum Jülich GmbH , 52425 Jülich , Germany.
  • Hinz RA; Faculty of Science , Helwan University , 11795 Cairo , Egypt.
  • Lömker P; Peter-Grünberg-Institut (PGI-6) , Forschungszentrum Jülich GmbH , 52425 Jülich , Germany.
  • Wilhelm M; Peter-Grünberg-Institut (PGI-6) , Forschungszentrum Jülich GmbH , 52425 Jülich , Germany.
  • Gloskovskii A; Peter-Grünberg-Institut (PGI-6) , Forschungszentrum Jülich GmbH , 52425 Jülich , Germany.
  • Bencok P; Photon Science, Deutsches Elektronen-Synchrotron DESY , 22607 Hamburg , Germany.
  • Schmitz-Antoniak C; Diamond Light Source , OX11 0DE Didcot , U.K.
  • Elnaggar H; Peter-Grünberg-Institut (PGI-6) , Forschungszentrum Jülich GmbH , 52425 Jülich , Germany.
  • Schneider CM; Debye Institute for Nanomaterials Science , 3584 CG Utrecht , The Netherlands.
  • Müller M; Peter-Grünberg-Institut (PGI-6) , Forschungszentrum Jülich GmbH , 52425 Jülich , Germany.
ACS Appl Mater Interfaces ; 11(7): 7576-7583, 2019 Feb 20.
Article em En | MEDLINE | ID: mdl-30672270
ABSTRACT
We demonstrate the emergence and control of magnetic phases between magnetite (Fe3O4), a ferrimagnetic halfmetal, and SrTiO3, a transparent nonmagnetic 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 hard X-ray photoelectron spectroscopy and X-ray magnetic circular dichroism 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. 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.
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Revista: ACS Appl Mater Interfaces Assunto da revista: BIOTECNOLOGIA / ENGENHARIA BIOMEDICA Ano de publicação: 2019 Tipo de documento: Article País de afiliação: Alemanha

Texto completo: 1 Base de dados: MEDLINE Idioma: En Revista: ACS Appl Mater Interfaces Assunto da revista: BIOTECNOLOGIA / ENGENHARIA BIOMEDICA Ano de publicação: 2019 Tipo de documento: Article País de afiliação: Alemanha