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Spin-Selective Interface Engineering in Oxide-Ferromagnetic Junctions via Atomic-Scale Oxygen Control.

David Maximilian Janas1, Mira Sophie Arndt1, Jonah Elias Nitschke1

  • 1Department of Physics, TU Dortmund University, Dortmund, Germany.

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Summary
This summary is machine-generated.

We developed a method to precisely control interfacial oxygen in MgO/Fe(100) heterostructures. This allows tuning spintronic properties by managing oxygen levels, creating a benchmark for oxide/metal junctions.

Keywords:
MgO/Fe interfaceepitaxial growthmagnetic tunneling junctionsmomentum microscopyspintronics

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Surface Science

Background:

  • Atomic-scale control of oxide-ferromagnet interfaces is vital for spintronic devices.
  • Interfacial oxygen in MgO/Fe(100) is difficult to control and verify, impacting device performance.

Purpose of the Study:

  • To deterministically tune the MgO/Fe(100) interface by controlling oxygen content.
  • To establish a calibrated growth protocol for reproducible interface fabrication.
  • To investigate the impact of interfacial oxygen on spintronic properties.

Main Methods:

  • Reactive growth under controlled oxygen exposure.
  • Momentum-resolved photoemission spectroscopy.
  • Complementary spectroscopic methods (e.g., work function measurements).
  • Spin-resolved photoemission spectroscopy.

Main Results:

  • Successfully tuned MgO/Fe(100) interfaces from oxygen-free to fully oxygen-intercalated states while preserving epitaxy.
  • Identified oxygen-dependent k-space fingerprints originating from the buried interface.
  • Linked k-space signatures to interfacial chemistry, structure, work function, and an interface resonance.
  • Demonstrated post-growth conversion of interface terminations.
  • Observed reduced spin contrast at the Fermi level with oxygen intercalation.

Conclusions:

  • Developed a calibrated protocol for reproducible preparation and identification of three distinct interface terminations.
  • Established MgO/Fe(100) as a benchmark system for optimizing spintronic functionality in oxide/metal junctions.
  • Showcased interfacial oxygen as a tunable parameter for spintronic applications.