Probing buried magnetic interface structure with the quantum size effect in spin-dependent electron reflectivity

Area of Science:

• Condensed Matter Physics
• Surface Science
• Materials Science

Background:

• The quantum size effect (QSE) influences electronic properties of thin films.
• Understanding electron reflectivity is crucial for nanoscale material characterization.
• Spin-polarized studies provide insights into magnetic material behavior.

Purpose of the Study:

• To investigate the spin-dependent quantum size effect (QSE) in iron (Fe) thin films.
• To analyze electron reflectivity from Fe films grown on a copper (Cu) precovered W(110) surface.
• To probe the electronic band structure and interface properties of these Fe films.

Main Methods:

• Spin-polarized low-energy electron microscopy (SPLEEM) was employed.
• Electron reflectivity was measured as a function of energy and film thickness.
• Quantum well resonance conditions were analyzed to extract electronic information.

Main Results:

• Spin-dependent QSE-induced oscillations in reflected intensity were observed.
• Spin-dependent quantum well resonances in the Fe film were identified.
• The unoccupied electronic bands of the Fe film were determined, showing a downward shift compared to bulk Fe.
• The buried interface was localized one atomic layer above the W(110) surface.

Conclusions:

• The Cu layer influences the electronic structure of the Fe film.
• SPLEEM is effective in revealing spin-dependent electronic states and interface characteristics.
• The study provides detailed information on the electronic band structure of Fe thin films influenced by the buried interface.