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Updated: Jul 18, 2026

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Spin-dependent quantum interference from epitaxial MgO thin films on Fe(001).

Y Z Wu1, A K Schmid, Z Q Qiu

  • 1Surface Physics Laboratory (National Key Laboratory), Fudan University, Shanghai 200433, China. wuyizheng@fudan.edu.cn

Physical Review Letters
|December 13, 2006
PubMed
Summary

Spin-polarized electron reflection from magnesium oxide films reveals quantum interference effects. A bulk-like energy gap forms in films over 3 atomic layers thick, with spin-dependent reflectivity amplitude at the interface.

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Area of Science:

  • Solid State Physics
  • Surface Science
  • Quantum Mechanics

Background:

  • Understanding electron behavior at interfaces is crucial for spintronic devices.
  • Magnesium oxide (MgO) is a key material in magnetic tunnel junctions.
  • Spin-polarized low energy electron microscopy (SPLEEM) probes surface magnetism and electronic structure.

Purpose of the Study:

  • To investigate spin-dependent electron reflection from MgO thin films on Fe(001).
  • To determine the electronic band structure of MgO films using quantum interference.
  • To analyze the influence of film thickness on the MgO energy gap and interface reflectivity.

Main Methods:

  • Utilizing spin-polarized low energy electron microscopy (SPLEEM) to measure electron reflectivity.

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  • Analyzing quantum interference patterns in electron reflectivity data.
  • Correlating reflectivity changes with MgO film thickness.

    • Main Results:

    • Observed quantum interference in electron reflectivity, enabling determination of two MgO energy bands with Delta1 symmetry.
    • Established that a bulk-like MgO energy gap forms in films exceeding 3 atomic monolayers.
    • Demonstrated spin-dependent amplitude and spin-independent phase changes in electron reflectivity at the MgO/Fe interface.

    Conclusions:

    • The electronic band structure of thin MgO films can be probed via electron reflectivity.
    • MgO films thicker than 3 atomic monolayers exhibit a well-defined energy gap.
    • The MgO/Fe interface shows distinct spin-dependent and spin-independent electron reflection characteristics.