Transparent ferromagnetic and semiconducting behavior in Fe-Dy-Tb based amorphous oxide films

Area of Science:

• Materials Science
• Solid State Physics
• Thin Film Technology

Background:

• Amorphous thin films offer unique electronic and magnetic properties.
• Transition and lanthanide metals are key components in advanced materials.

Purpose of the Study:

• To synthesize and characterize amorphous thin films of Fe, Dy, and Tb.
• To investigate the correlation between composition and functional properties.

Main Methods:

• Electron beam co-evaporation at room temperature.
• Grazing incidence X-ray diffraction and X-ray photoelectron spectroscopy.
• Electrical resistivity, sheet resistance, and optical band-gap measurements.

Main Results:

• Amorphous films with varying Fe to Lanthanide ratios (R) were produced.
• Films with R=0.6 exhibited semiconducting behavior with visible light transmission (2.49 eV band-gap), low resistivity, and room temperature ferromagnetism.
• A metal-to-semiconductor transition was observed for R < 11.9, linked to oxidation states.

Conclusions:

• The synthesized amorphous Fe-Dy-Tb films possess a unique combination of electronic and magnetic properties.
• These materials are promising for transparent conductors, thin-film transistors, and spintronic applications.