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Spin-polarized surface state in EuO(100).

Jürgen Klinkhammer1, Martin Schlipf2, Fabian Craes1

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Physical Review Letters
|February 4, 2014
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Summary
This summary is machine-generated.

High-quality films of the ferromagnetic semiconductor Europium Oxide (EuO) exhibit a spin-polarized surface state below their Curie temperature. This discovery, observed on epitaxial graphene, advances understanding of magnetic semiconductor properties.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Surface Science

Background:

  • Epitaxial graphene on Iridium (Ir(111)) serves as a substrate for growing high-quality ferromagnetic semiconductor films.
  • Understanding the electronic properties of ferromagnetic semiconductors like Europium Oxide (EuO) is crucial for spintronic applications.

Purpose of the Study:

  • To investigate the electronic properties of Europium Oxide (EuO) films grown on epitaxial graphene.
  • To analyze the behavior of surface states in EuO, particularly their temperature and energy dependence.
  • To determine if the surface state exhibits spin polarization below the Curie temperature.

Main Methods:

  • Growth of high-quality EuO films on epitaxial graphene on Ir(111).
  • In situ investigation using scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS).
  • Analysis of electron scattering at defects to identify surface states.
  • Temperature-dependent and energy-dependent measurements of the surface state.
  • Comparison of experimental results with density functional theory (DFT) calculations.

Main Results:

  • Standing-wave patterns due to electron scattering at defects confirm the existence of a surface state in EuO.
  • A significant energy shift of the surface state was observed upon cooling below the Curie temperature (TC).
  • This energy shift indicates spin polarization of the surface state at low temperatures.
  • Experimental findings align well with theoretical DFT calculations.

Conclusions:

  • A spin-polarized surface state exists in ferromagnetic EuO films grown on epitaxial graphene.
  • The observed spin polarization is linked to the magnetic ordering below the Curie temperature.
  • The study provides insights into the electronic and magnetic properties of EuO/graphene heterostructures, relevant for future spintronic devices.