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Tunable Magnetic Phases at Fe3O4/SrTiO3 Oxide Interfaces

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2019

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Hamed, Mai Hussein
Hinz, Ronja Anika
Lömker, Patrick
Wilhelm, Marek
Gloskovskii, Andrei
Bencok, Peter
Schmitz-Antoniak, Carolin
Elnaggar, Hebatalla
Schneider, Claus M.

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https://doi.org/10.1021/acsami.8b20625
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ACS Applied Materials & Interfaces. American Chemical Society (ACS). 2019, 11(7), pp. 7576-7583. ISSN 1944-8244. eISSN 1944-8252. Available under: doi: 10.1021/acsami.8b20625

Zusammenfassung

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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Fachgebiet (DDC)
530 Physik

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Verwey transition, Magnetite, Fe3−δO4, spin moment, spintronics, heterointerfaces

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ISO 690HAMED, Mai Hussein, Ronja Anika HINZ, Patrick LÖMKER, Marek WILHELM, Andrei GLOSKOVSKII, Peter BENCOK, Carolin SCHMITZ-ANTONIAK, Hebatalla ELNAGGAR, Claus M. SCHNEIDER, Martina MÜLLER, 2019. Tunable Magnetic Phases at Fe3O4/SrTiO3 Oxide Interfaces. In: ACS Applied Materials & Interfaces. American Chemical Society (ACS). 2019, 11(7), pp. 7576-7583. ISSN 1944-8244. eISSN 1944-8252. Available under: doi: 10.1021/acsami.8b20625
BibTex
@article{Hamed2019-02-20Tunab-53621,
  year={2019},
  doi={10.1021/acsami.8b20625},
  title={Tunable Magnetic Phases at Fe<sub>3</sub>O<sub>4</sub>/SrTiO<sub>3</sub> Oxide Interfaces},
  number={7},
  volume={11},
  issn={1944-8244},
  journal={ACS Applied Materials & Interfaces},
  pages={7576--7583},
  author={Hamed, Mai Hussein and Hinz, Ronja Anika and Lömker, Patrick and Wilhelm, Marek and Gloskovskii, Andrei and Bencok, Peter and Schmitz-Antoniak, Carolin and Elnaggar, Hebatalla and Schneider, Claus M. and Müller, Martina}
}
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