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Spin polarization of the two-dimensional electron gas at the EuO/SrTiO3 (001) interface

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2025

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Darmawan, Andri
Fedchenko, Olena
Tkach, Olena
Chernov, Serhii V.
Kutnyakhov, Dmytro
Scholz, Markus
Hoesch, Moritz
Rossnagel, Kai
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http://nbn-resolving.de/urn:nbn:de:bsz:352-2-1fvi0d52ugwlw5
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https://doi.org/10.1103/physrevmaterials.9.064401
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Deutsche Forschungsgemeinschaft (DFG): SFB 1432
Deutsche Forschungsgemeinschaft (DFG): 425217212, B03
Deutsche Forschungsgemeinschaft (DFG): TRR 173, 268565370, A02
Deutsche Forschungsgemeinschaft (DFG): CRC 1242, 278162697, C02
Institutionen der Bundesrepublik Deutschland: 05K22VL1
Institutionen der Bundesrepublik Deutschland: 05K22UM1

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Physical Review Materials. American Physical Society (APS). 2025, 9(6), 064401. eISSN 2475-9953. VerfĂŒgbar unter: doi: 10.1103/physrevmaterials.9.064401

Zusammenfassung

Spin-polarized two-dimensional electron gases (2DEGs) are of particular interest for functional oxide electronics applications. The redox-created 2DEG residing on the strontium titanate, SrTiO3 (STO), side of a europium monoxide (EuO)/SrTiO3 (001) interface is expected to be significantly spin polarized due to the proximity to the strong (7đœ‡đ”/𝑓.𝑱.) Heisenberg ferromagnet EuO. We apply magnetic circular dichroism in the angular distribution (MCDAD) of photoemitted electrons to investigate whether and how the induced spin polarization of the 2DEG depends on the dimensionality of the overlaying EuO layer. The experimental data are complemented by density functional theory calculations with a Hubbard 𝑈 term (DFT+𝑈). We show that the EuO/STO interfacial 2DEG is spin polarized even for ultrathin EuO overlayers, starting at an EuO threshold thickness of only two monolayers. Additional EuO monolayers even increase the induced magnetic Ti moment and thus the spin polarization of the 2DEG. Our results and the potential to enhance the magnetic order of EuO by other proximity effects indicate that the EuO/STO(001) interface is an ideal template for creating (multi-)functional spin-polarized 2DEGs for application in oxide electronics.

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ISO 690ROSENBERGER, Paul, Andri DARMAWAN, Olena FEDCHENKO, Olena TKACH, Serhii V. CHERNOV, Dmytro KUTNYAKHOV, Markus SCHOLZ, Moritz HOESCH, Kai ROSSNAGEL, Martina MÜLLER, 2025. Spin polarization of the two-dimensional electron gas at the EuO/SrTiO3 (001) interface. In: Physical Review Materials. American Physical Society (APS). 2025, 9(6), 064401. eISSN 2475-9953. VerfĂŒgbar unter: doi: 10.1103/physrevmaterials.9.064401
BibTex
@article{Rosenberger2025-06-02polar-74008,
  title={Spin polarization of the two-dimensional electron gas at the EuO/SrTiO<sub>3</sub> (001) interface},
  year={2025},
  doi={10.1103/physrevmaterials.9.064401},
  number={6},
  volume={9},
  journal={Physical Review Materials},
  author={Rosenberger, Paul and Darmawan, Andri and Fedchenko, Olena and Tkach, Olena and Chernov, Serhii V. and Kutnyakhov, Dmytro and Scholz, Markus and Hoesch, Moritz and Rossnagel, Kai and MĂŒller, Martina},
  note={Article Number: 064401}
}
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