Texture evolution of vertically aligned biaxial tungsten nanorods using RHEED surface pole figure technique

Area of Science:

• Materials Science
• Thin Film Deposition
• Nanotechnology

Background:

• Tungsten nanorods are essential for various applications.
• Controlling nanorod crystal structure and orientation is critical for performance.
• Biaxial texture influences material properties and functionality.

Purpose of the Study:

• To investigate the development of biaxial texture in vertically aligned tungsten nanorods.
• To analyze the effect of deposition parameters on nanorod texture evolution.
• To understand the relationship between texture and in-plane capture area.

Main Methods:

• Deposition of vertically aligned tungsten nanorods via DC magnetron sputtering.
• Utilizing glancing angle flux incidence (approx. 85 degrees) and a two-step substrate rotation mode.
• Analysis of biaxial texture evolution using reflection high-energy electron diffraction (RHEED) pole figure technique.

Main Results:

• Biaxial texture inception observed between 10-25 nm, completing by 50-100 nm.
• Out-of-plane crystallographic direction identified as [002].
• Anomalous in-plane texture selection observed, deviating from maximum capture area when the [002] axis tilts towards the incident flux.

Conclusions:

• The study demonstrates successful growth of vertically aligned biaxial tungsten nanorods.
• Substrate rotation significantly impacts biaxial texture development.
• Anomalous texture behavior highlights complex growth dynamics under glancing angle deposition.