Structural analysis of co-sputtered Cu-Nb and Cu-Pd textured thin films

Area of Science:

• Materials Science
• Nanotechnology
• Thin Film Physics

Background:

• Characterizing nanoscale two-metal-phase systems with minority elements is challenging due to frozen disorder from co-sputtering.
• Accurate quantification of elemental distribution and internal disorder in such systems requires advanced analytical models.
• Understanding self-organization of elements within a matrix is key to controlling material properties.

Purpose of the Study:

• To present a novel model for describing the structural distribution of alloy elements in magnetron-sputtered copper (Cu) thin films.
• To analyze two contrasting cases: Cu films with immiscible Niobium (Nb) and alloy-forming Palladium (Pd).
• To compare X-ray diffraction (XRD) data with energy-dispersive X-ray spectroscopy (EDX) for elemental distribution analysis.

Main Methods:

• Development of a computational model to fit diffraction patterns from various geometries.
• Magnetron sputtering of copper thin films with minority elements (Nb and Pd).
• Analysis using X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDX).

Main Results:

• The model successfully describes the structural distribution of alloy elements in Cu thin films.
• Contrasting behaviors observed for immiscible Nb and alloy-forming Pd within the Cu matrix.
• Validation of the model through comparison with EDX-derived elemental distribution.

Conclusions:

• The developed model provides a robust framework for structural characterization of complex nanoscale alloy systems.
• The study highlights the importance of considering element miscibility and thermodynamic properties in thin film design.
• This work advances the understanding and characterization of disordered alloy thin films for potential applications.